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A customer of mine is complaining that his rear diff is whining after a service at our location. We mistakenly installed dino GL_5 (limited slip additive included) instead of the Ford- recommended synthetic GL-5. Vehicle is a 2004 Ford F-250 4-wheel drive. Service was done less than 1000 miles...

I just bought a 'Super-Tech' ST8A filter and on the box it states 99% First pass efficiency, and 98% multi pass efficiency, as tested by Champion laboratories.Are these good ratings? And do they really mean anything? And, most importantly, is the ST filter any good?

What are the differences between all the different base stocks that I see talked about all the time here? Such as group II,II+,III,IV and so on. Does it really make a difference?

I have recently tested a new product in our locations, and it seems to do a pretty good job. It is called 'Ultimate ECD'(engine cleaning detergent), and it is sold by C.A.T. products (Run-Rite products). I believe that it is only availible professionally and is not availible retail. Pennzoil/QS...

OK, I need the help of the experts here, and correct me if I make a mistake.(I often do) From reading the various posts on this forum, I understand that when the motor-oil rating was changed from SH to SJ( in 1996, I think), a significant amount of friction-reducing additives were taken out to...

I have not been able to get a consistent answer to this question from any of the oil reps I have talked to. For years, I have always believed that GL-5 could not be used in a GL-4 application. I was told by several oil company engineers that the additives in GL-5 are not compatible with the...

This is my first post here, and it sure looks like you guys know your stuff! Anyway, I read a few years ago that Mobil corp. was claiming that Castrol was calling thier Syntec oil 'synthetic', when in Mobil's opinion it was dino. And that the gov. says Castrol is allowed to 'stretch' the...