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I bought a CPO BMW 325i with 29k on the clock. Before purchase I looked in the oil cap and everything looked clean....After purchase I pulled the valve cover and it looks fantastic...zero sludge and no varnish, in fact it looked like a new engine. According to the service records, the oil was...

I have always been of the school that thicker is better. But after looking at many UOA's with 20W's I am starting to become curious about the thinner oils. So what makes an engine 20W friendly? If a car specs a 5W-30, what would the harm be using a 5W-20? Ford and some others must be onto...

I have a 1970 Dart with a /6. Through the recommendation of this board I went with Delo 400 15W-40. Since I owned this Dart it has had a slight rear main seal leak that would leave spots under the car whenever sitting more then a few minutes. I have put maybe 200 miles since I switched to the...

What is an ester and why is it used in motor oils? I have read that Red Line and German Castrol 0W-30 use esters and other oil brands do not. Why is this?

I have a /six with unknown miles. I was thinking awhile back that I might try Auto-RX, until I read the treatment length. I only drive this car about 100 miles a month, if that. I also will not leave this oil in the car for longer then a year, and was really planning on doing six month OCI's...

I am seeing a few new cars with extended drains. My Ion says to do an OCI when the oil life monitor says so, which was at 6.5k even though I changed my oil at 1k, 4k and went to M1 at 7k. With most people doing their oil changes at places like Jiffy Lube and others, and if they disreguarded the...

Curious what you guys think is the best, cheap group III?

What makes German Castrol such a good motor oil? How is it different then American 0W-30? What makes it different then the rest of the America Castrol Syntec line? Why do you think it is better then Mobil 1, Amsoil etc.? I see alot of GC love here, and have to admit being sucked in a bit to the...

I filled my tank with some new Shell the other day and my car has been running like crap. It has been having a hard time starting after running awhile and my car seems to be burning through this tank like I am getting about 10mpg. It's a 2004 Saturn Ion with 7.4k and ran flawless up to this...

I have a 1970 Dodge Dart Swinger with a 225 Slant Six. The car is in great condition, but has unknown miles. The car is only driven 100 or so miles a month. I plan to someday drop a 360 in it...but that is a way off. I live in Los Angeles were the temps currently are in the 90's with winter...

Just switch to M1 10W30 on my Ion at 7,200 miles. I plan to do 7,500 mile OCI's. Do you think there is any benefit in using Lube Control?

I was the fleet manager for a magazine distribution company in Los Angeles back in the 1980's. Here are some funny stories and what abuse I have seen vehicles handle. When I was given the duty of scheduling maintenance for our fleet we had six 1986 Nissan Hardbody P/U's that were given to a few...