reply to Doctor Olds
Re: [Help] 20w30 Oil? What is that used for? you seem to miss the part where it says all seasons in that same manual.
higher viscosity oils have higher pumping pressures, higher pressures mean less flow(basic fluid dynamics), during start-up you want as much oil to circulate as fast as possible to lubricate the components of the engine that have been sitting since the last time it started and worked most of it's way off the parts during cool down when the oil returns to it's cold viscosity or at least close to it, which is rated at 75° F.
and unless his engine oil is hitting well over 212°F or averages above 75°F sitting still there is no gain in going up to a higher weight oil, only the potential losses, again, there is NO GAIN
All Things Unix
You said three things, each of which was factually incorrect:
• 20w30 is usually used as gear oil.
• as for the damage it would/could cause, pump wouldn't be able to move the fluid, it wouldn't be able to lubricate the parts and it would scratch the shit out of the cylinders and eat the piston rings.
• now at operating temperature it would be "fine" but cold would be a massive issue.
Since then, you've been dancing, deflecting and obfuscating. The ideal oil weight has been identified and the OP's question answered. Can we all agree that you were wrong and move on?
i have seen it used as gear oil, and up until this point it's the only place i had seen it used, so that was based on my observation of it's use, guy at work says it's used in heavy equipment(diesel) as someone else stated new information to me since this started.
"Now you can see that the difference between the desired thickness your engine requires ( = 10 ) is closest to the 0W-30 oil at startup. It is still too thick for normal operation. But it does not have far to go before it warms up and thins to the correct viscosity. Remember that most engine wear occurs at startup when the oil is too thick to lubricate properly. It cannot flow and therefore cannot lubricate. Most of the thick oil at startup actually goes through the bypass valve back to the engine oil sump and not into your engine oil ways. This is especially true when you really step on that gas pedal. You really need more lubrication and you actually get less."
"There is currently no engine oil thin enough to operate correctly at startup"
am i the only one that is actually reading about this as we go and double checking information ?
i might not have been completely correct on the extent of the damage, but it is true that it can cause excess wear and there is no real point in using it.
So, that's a no?