Bob the oil guy website guidlines

[madmaxx]

If the oil pump is a positive displacement pump then flowrate at the discharge of the pump is always the same for a given rpm up to its releif valve setting. Once the relief valve lifts it is recirculating back to the pan.

I guess I see the advantage of heavier oil is the boundry layer between the piston skirts and cylinder walls, bearings surfaces etc are thicker ensuring no metal to metal contact. This assumes the component gets oil to begin with.

It would appear if you like heavier oil Mobil 1 15W50 may be the answer since it has the 1200 and 1300 ppm of phosphorous and zinc.

Thanks for all the replies.

Originally Posted by Bob In Ct

It's too bad we only have oil pressure gauges. If we had an oil flow gauge many of us would be using a less viscous oil. What good is 80 PSI if it's not moving?

Bob

[Ant]

BTOG has a lot of information and like a lot of us is on a quest for the best oil for our applications.
These statements like 0-40 for our engines is just BS.
Use the oil that has is built for eg flat tappet camshafts normally a race oil that can be used on the street etc etc.
My Toyota Vitz 1000cc they recommend 5w30 so I use Castrol Edge 5w30 full synthetic as I travel 100 miles round trip to work.

I am going to use Schaeffer 20-50 race oil in my Cobra and it will be heated in the oil tank before use. I use what my engine builder recommends and what the leading race guys are using plus Schaeffer oil is recommended for extended oil changes. Schaeffer oil has excellent start up properties, the only minor detail might be a slight hp loss due to being thicker, I would prefer to have the protection when hot and under hard use. For the road I would use Chevron 400 15w40 as I know people that have done 300,000miles in petrol engines still going strong this oil is made for diesel and petrol engines.