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Switching back to conventional oil?
Hi TN - hoping someone can give me a clear explanation here. Did a lot of googling but I'm still a little confused.
My Camry with 145K is leaking just a little bit of oil. I bought it 3 years ago with 131K, but I think conventional oil was always used on it. Since I had always used Mobil 1 High-Mileage Full Synthetic on my other 2001 Camry, I started using the same on the “new” Camry. I knew at the time that using synthetic oil in an older engine that hadn't been using synthetic oil could cause leaks to appear, but I didn't notice any problems with oil leaking until a few months ago.
This is what I don't understand: How is synthetic oil of the same weight/rating (5W-30) any "thinner" than conventional oil of the same weight? If the oil was truly thinner/lower viscosity, shouldn't it have a lower weight? Eric the car guy had the best explanation I could find, where he considered the "viscosity" to be attributed to the weight and "flow rate" to be attributed to conventional vs synthetic, but that didn't make a whole lot of sense to me since isn't the flow rate based on the viscosity?
So, I'm going to stop using Full Synthetic 5W-30 with my next oil change. But, what difference does it make if I switch to conventional 5W-30 (same weight, but conventional oil) or switch to a higher-viscosity Full Synthetic like 5W-40, 10W-30, or 10W-40?
Any input is appreciated. Thanks!
2001 Camry LE 2.2L, Black, 146K as of 6/19
Bought 10/16 with 131K
2001 Camry LE 2.2L, Lunar Mist Metallic, 96K as of 6/19
Bought 6/01 brand new