[78w72]

i was mainly replying to & supporting the other comments that were made about 20/50 being thicker than necessary for a real street engine.

the points i mentioned are not opinion, these are facts:
thinner oil flows through bearings & other tight tolerances better than a thick oil & therefore cools those parts better.
thinner oil reduces wear at start up.
no american car maker calls for 20/50 oil.
in colder climates/seasons, (not just alaska in the winter) 20/50 has no advantage or reason to use over a thinner weight oil in the average street engine.

just pointing out my "opinion" based on facts. i agree & said to use what oil you like & that 20/50 wont blow up your engine if youre a "thicky", just that there are advantages to thinner oils in a average street car. yes if you have low oil psi on a 200-300k engine then use 20/50 as a band aid. if you have a nice running unworn pontiac street engine & as cliff would say, "you drive to the dairy queen & do some burnouts when leaving" or even if you have a 450-500hp street car you take to the track occasionally, you simply dont "need" to use a 20/50 oil. fact.

[Steve C.]

"I was mainly replying to & supporting the other comments that were made about 20/50 being thicker than necessary for a real street engine."

Ditto here. I was just throwing out a tid bit for conversation. Mark at Luhn and a local engine builder asked about my bearing clearance then both stated to stick with the 10W-30.

HOW MUCH CLEARANCE DO YOUR BEARINGS NEED?

https://www.mahle-aftermarket.com/me...l77-1-205r.pdf


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[mchell]

That’s a good deal for 15qts!!! Crazy fire sale

If only they had the VR-1 10w/30 at that price....... can never find my size on sale

[Chris65LeMans]

Just ordered. Thanks!

[Formulas]

I Like's 15/40 half 10/30 half 20/50 bam

[Steve C.]

Mixing oils of different viscosity...?

This exchange from the question.....

"Number on left is the Winter weight of the oil measured at 32 Degrees F. and the number on the right is the Viscosity of the oil at 212 Degrees F.
NO, it is NOT OK to mix oils... No Manufacturer or Oil Manufacturer will say it is OK to blend oils unless they are the exact same oil. Even within their own brand. Mixing your own cocktails is Never a good idea as Additive packs may vary between grades of even the same OEM. If you think you need to blend oils or use an oil additive, you just need a better oil."

Then this....

"All mineral oils are produced from the same basic petroleum feedstocks. Different oil viscosities will not separate or react negatively to each other because the base oil is molecularly the same. It's the different oil additive systems between brands that shouldn't be mixed - if you're concerned about the oil performing exactly how it was designed."

And on with more conversation, if interested.

https://www.600rr.net/threads/mixing...cosity.133221/


Posted for interest only, not here to suggest it's OK or 'wrong' !



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[64speed]

20/50 cause my builder told me too.

[Dragncar]

I live in California, 006 on pistons, .003 on rod and mains . Properly warm your engine up, what is the issue ? Get a engine hot and they all are pretty thin.

[Formulas]

Steve C. .. What do oil manufactures do ? They mix
And I use exact same oils brand and line just different viscosity
Glad you pointed out winter weight now observe how many on this site think the opposite

The W number is the base oil as well what happens when hot is a result of the additives, they change shape making the oil more viscous

[Cliff R]

I like to stay with the thicker oils for flat tappet set-ups but have went to 10W-30 for all of our roller cammed engines. No issues with any of them. For the 15W-40 have always used Rotells simply because I buy it for my John Deer tractors so always have plenty around. For 10W-30 I use NAPA oil with no additional additives.....

[78w72]

ok, who is "stuart" & why is he editing our posts? i assume hes a moderator but what on this thread required a stealth edit of posts?

[Steve C.]

Fact or not I took note of this statement....

"Never a good idea as Additive packs may vary between grades of even the same OEM."

As I understand that. Company 'XYZ' multi-grade oils may use the same base stock for each of their different grade oils but each grade will have a very different additive package (polymeric viscosity index improver) added to it.
It's the mixing of these different additives not the base stock.

But here only it says between different brands....


"All mineral oils are produced from the same basic petroleum feedstocks. Different oil viscosities will not separate or react negatively to each other because the base oil is molecularly the same. It's the different oil additive systems between brands that shouldn't be mixed - if you're concerned about the oil performing exactly how it was designed."

Confusing

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[grandam1979]

I’m thinking it got edited because someone was nice enough to post about oil on sale at a great price and you guys jumped in saying how dumb it is to use that oil. Maybe that’s what happen. that’s what I saw anyway but that could just be me. If you want to debate oil viscosity open up a new post and have at it.

[Steve C.]

Further to aid in conversation here for some who may have interest. I just contacted a good friend that was personally involved in the oil additives industry for years. And asked him. He agreed, mixing oils can be a BAD thing. Some additive packages do not play well with others, and you can have precipitates (crystals) form.

Again, it was not my personal intention to suggest to the OP or anyone else here they are dumb to use any specific brand of oil or to mix them. Just conversation around the coffee table.

Adiós


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[78w72]

nobody complained about posting oil on sale... there were a few general comments about 20/50 being thicker than needed for the majority of street engines backed up by some facts. i dont see an issue with that or reason to edit the posts.

what i saw was someone posting a reply in red letters as if they were mad people made comments about 20/50 oil or it was assumed we were complaining about the for sale link. i dont think any of the comments were intended that way. but if we now cant have a simple conversation or debate on things without being edited that kinda defeats the purpose of the forum... my apologies if my comments offended anyone.

[JLMounce]

Just a bit more fuel to the fire here, but there are modern cars that do run thick oil. Off hand I know the 2015+ Shelby GT500's use a 5w50 fill.

Granted, the car is utilizing a thinner cold rating, which lends some credence to what others are stating and that viscosity difference would likely mean that 50 weight hot viscosity would probably crack down a bit. My understanding being that the larger the spread in cold/hot viscosity, the more propensity for the hot viscosity to diminish.

Just pointing out that there is some precedent in high performance modern cars wanting a thicker oil.

I may try some of this in my engine. At hot idle I don't really like how far the oil pressure falls (12 psi at 800rpm). I typically rub mobil 1 10w30 and have tried 10w40 but that made no actual difference.

[grandam1979]

Originally Posted by Brian Baker

Why would you want to run this heavy oil in your Pontiac? Unless you're making your own atmosphere, I don't see the point.

I’m thinking this could have done it (respond in red) I know what I thought when I saw it. The thing is it’s everything that gets posted on this site can’t make it 10 post without being hijacked and sent off in a different way. I make a game out of counting how many it takes before it has nothing to do with the original topic. By the way I ordered 2 jugs thanks for original post.

[DiamondJim]

I run an Ultradyne solid cam with block filler to freeze plugs bearings slightly on the looser side and have used 20w50 w zinc for the last 20 years in the car. I also gave have 62 GP with the original 389 that I run it in with an extra can of stp with zinc to help. I don’t want 10 weight oil in my motors and that’s what 10w30 is at higher temps.

[78w72]

Originally Posted by JLMounce

Just a bit more fuel to the fire here, but there are modern cars that do run thick oil. Off hand I know the 2015+ Shelby GT500's use a 5w50 fill.

good point, however i wouldnt consider a 2015+ shelby gt 500 with 660-760hp & $60k+ price tag an average "street car" like what most have here in the street section that we were discussing. other modern performance cars like the 2015+ vettes use 5/30 & hemi challengers use 5/20 or 0/40, must be a reason for the thinner oils...

wait, a 10/30 oil is now 10 weight at higher temps ???

i agree threads get sidetracked, thats the nature of a forum. i apologize again if i contributed to that.

[grandam1979]

I don’t think he’s to at you by the way I run 20w50 full synthetic in mine wish they would put that on sale.