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Old 07-17-2019, 01:16 PM   #11 (permalink)
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"Proper Shitbox" (SOLD) - '96 Honda Civic LX fully optioned no weight reduction
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Not a ton. From class we had a little tribology portion in mechanical system design and the big weights weren't hugely different. I'm sure you could find a "temp and viscosity thickness" chart and compare different weights at x temp for your reference as it relates to your transmission. Main take away: gas mileage will only vary a small percent wise, but the friction goes up and decreases the life cycle rating if the bearing/wear tolerances are designed to maintain a certain gap /psi rating with the spec weight at x temperature and you put in a thicc er fluid or cool the fluid too much. Think: Toyota doesn't recommend 0w-20 in their 0w-16 designed motors.

"I feel like the bad decisions come into play when you trade too much of your time for money paying for things you can't really afford."

2010 Prius
1996 Ranger
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