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- Sep 28, 2002
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Quote:
So bearing clearances and oil feed orifices for lifters and chain tensioners will not be effected at all by moving up to a higher viscosity?
What I said was that there's no 20 or 30 grade that starts at a 20 or 30 grade at any ambient temp that humans can survive under. That means that if you're using a multivisc oil that is either a 20 grade or 30 grade ..it's WAY over visc at startup ....and both will transition through VERY high viscosity states before reaching operating visc. The 30 grade will start thicker ..but that's just ambient temperature semantics (Canada vs. south Tex.) So if a 30 grade causes you any "fear factor" where a 20 grade is spec'd ..you should dread starting the engine.
So bearing clearances and oil feed orifices for lifters and chain tensioners will not be effected at all by moving up to a higher viscosity?
What I said was that there's no 20 or 30 grade that starts at a 20 or 30 grade at any ambient temp that humans can survive under. That means that if you're using a multivisc oil that is either a 20 grade or 30 grade ..it's WAY over visc at startup ....and both will transition through VERY high viscosity states before reaching operating visc. The 30 grade will start thicker ..but that's just ambient temperature semantics (Canada vs. south Tex.) So if a 30 grade causes you any "fear factor" where a 20 grade is spec'd ..you should dread starting the engine.