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Originally Posted By: dew Ps, my 01 Tacoma has done so many short trips with 5w30 and 270K miles, I don't think start up wear will be an issue... And what are your winters like in your part of California? The single biggest factor that effects engine wear is how the vehicle is used. If you...

If you want to minimize engine wear on start-up I would stick to the 0W-20 grade. Toyota's own 0W-20 brand specifically designed with that goal in mind vs other OTC 0W-20 grades. If you're partial to Pennzoil I would go with their 0W-20 grade and annual oil changes if not longer. The limiting...

Originally Posted By: Shannow Originally Posted By: CATERHAM At you're next oil change prior to the winter I'd suggest going back to the spec' M1 5W-30. Or if you want to run the lightest 0W/5W-30 you can buy on start-up in a T.O. climate (short of blending your own) it to try Sustina 5W-30...

Originally Posted By: Shannow Originally Posted By: CATERHAM Originally Posted By: Emperors6 I see. What's the advantage of using a lighter oil? Fuel efficiency? If that's all there is, then I would prefer a heavier one if it sticks to the surfaces better. I care most about the life of the...

Originally Posted By: Emperors6 According to the engine spec , the minimum hot pressure are 6 psig @ 1000 RPM, 18 psig @ 2000 RPM, 24 psig @ 4000 RPM. Is the gauge giving me psig or psi so I can do a direct comparison? PSIG is PSI plus the atmospheric pressure wherever you are. So 24 psig in...

Originally Posted By: Shannow Your OEM provides a minimum oil pressure recommendation as a maintenance intervention point for a worn engine on the recommended oil viscosity...others on BITOG who have literally zero understanding of hydrodynamic lubrication (flow equals lubrication in their...

Originally Posted By: Gene K Redline 5W30 at 250F is roughly equal to 15W50 at 300F. I would base which grade I use on peak oil temps in track use. Be aware you also have to take into account sump temps will usually rise with increased oil grade. As long as oil temp doesn't exceed 260F the 5W30...

Originally Posted By: Emperors6 I see. What's the advantage of using a lighter oil? Fuel efficiency? If that's all there is, then I would prefer a heavier one if it sticks to the surfaces better. I care most about the life of the engine over fuel costs. Yes fuel efficiency is one advantage as...

I would think so. Doesn't Fram claim an even longer duration for their Ultra long drain filter? What you could do if you still have the used filter with 15K on it, is to cut it open to determine first hand how clogged it is, if at all.

I agree you could extend your OCI to 10,000 miles if you chose to. The viscosity drop is not excessive.

I wouldn't run an oil that heavy straight. I'd cut it 50/50 with a 0W-20 to give you a heavier higher VI 0W-30 than Mobil's own 0W-30. My choice in a 0W-20 would be the Mobil made Toyota brand 0W-20 although you could also use M1 AFE 0W-20.

As others have mentioned your oil consumption is not anything to be concerned about nor to try and remedy. And a 0W-40 is not lighter than the 5W-30 you're using on start-up unless it's extremely cold and then you'd still be better off using a 0W-30.

Originally Posted By: drtyler I believe API SN only limits phosphorus. But the amount of P and Zn are related somewhat. P and Zn are both elements in the ZDDP molecule. It's P that contributes the AW EP boundary protection on ferrous metals. Yes this is a good UOA although there is obviously...

There is no way that the KV40 is 56.56cSt. Even a dino 5W-20 is around 48cSt. I suspect BlackStone screwed up in some way. I would definitely contact them and ask for a retest.

Originally Posted By: Shannow There's PLENTY of oil on the cylinder walls, and being viscous, it's providing a high degree of hydrodynamic lubrication... The oil that gets to the cams via side leakage from the cam bearings will be similarly viscous, and if sprays are involved, the higher oil...

Originally Posted By: Shannow Originally Posted By: CATERHAM Yes it's a positive displacement pump but if the relief valve is open, which limits the maximum oil pressure, some oil will be diverted back to the sump. This will happen even with a 0W-20 at higher rev's and moderately cold temp's but...

Originally Posted By: InhalingBullets Saturday my wife and I purchased a new 2016 Prius for her to drive in her home health business. The car comes with free (5k oci) oil changes up to 25k miles with an unknown conventional oil. Here in lays my dilemma, should I have them do the OCIs free with...

Yes it's a positive displacement pump but if the relief valve is open, which limits the maximum oil pressure, some oil will be diverted back to the sump. This will happen even with a 0W-20 at higher rev's and moderately cold temp's but of course less so than with a lower viscosity index 5W-20.

For winter, I do have a block heater, so there's that at least. I'm waiting for my local Canadian Tire to have a sale, and then I'll get some synthetic for my next oil change. Originally Posted By: CATERHAM Well at least your truck is spec'd for a 20 grade oil. A synthetic 5W-20 isn't going...