Quote:
Originally Posted by 78w72
Not criticizing his builders choice at all, just reply to the comment that its because synthetic causes leaks... or that changing from regular oil to synthetic causes leaks. Very old outdated myths.
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I thought that also. For a long time. BUT, I added full synthetic Valvoline to my 5.3L Chevy truck. It had around 100,000 miles at that time. This thing, I bought new. I only, work on it. I got a deal on the oil. So, I used it. Truck only had regular oils since new.
Thing started leaking a short time later. I have changed the oil pan gasket and the valley gasket. It still has a small leak today at 150,000 miles. Prolly the cam sensor o ring.
Thing is, I used the same synthetic oil in my NEW built poncho 455. Even with rope seal. NO leaks.
So, maybe not a myth as I thought also. I`m 60 years old and have been a mechanic for 25 years, even though I`m out now. So, this is new to me and maybe not a myth.
