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More then likely its your oil control rings not working properly or on there way out, and only working when they want to...
Assuming that you have an old motor with no rebuild, 20/50 was the way to go, even on the new motors i build for myself or my customers i still use 20/50 weight for the all around assurance of knowing im getting good lube...And on older motors with high miles and wear and tear on them having a weight that high is crucial in sparing more miles out of them...
Let us know what happens
teddy
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 One Turbo At A Time
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