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Shannow: Ahh, low speed and idling creates less sealing pressure on the rings. Same thing could happen with stick rings but I would think in that case the problems would be universal. Chris: I live in a very rural area of Ohio. The nearest "big" town is 12 miles away and has a population of...

Yep, two answers to a new trans, either get a cooler line filter installed right away to catch the built-in and break-in contamination, or dump the oil within 5K miles. Test statistic show the average automatic generates 75% of it's lifetime amount of contaminants in the first 5K miles or less...

Yeah, good stuff. Thanks. I have some older stuff from various mfrs but this seems especially well done.

I use a Fumoto and it's worth the money to me just to be able to take clean oil samples. If you have no specific need these capabilities confer, they probably aren't worth the money. They latch closed and you can safety wire, or zip-tie them that way.

Originally Posted By: Dufus2 I have a Frantz filter on a Mercedes to clean the engine oil after it was intentionally contaminated with a very fine particulate compound believed to be mica like is used in paint. The oil felt gritty like a polishing compound. The same stuff ruined my Tahoe engine...

Mine has always used the oil from between the top mark to about halfway down to ADD much more quickly than from that halfway to ADD. When I first got the truck, it only had 7K miles, I was adding oil like mad to keep it at full (I was also using the spec'ed dual rated 10W30 SG/CF PCMO). I...

I spent some time this morning rereading the relevant parts of both the referenced texts above, the SAE and the Dutch book referenced later in the the thread, and I'm beginning to think I didn't give the ZDDP differences between an HDEO and a PCMO enough weight in the context of a flat tappet...

Originally Posted By: Gokhan You're now being nothing but argumentative. Since you want to get personal, I merely am mirroring your snotty, condescending, holier-than-thou style. You've read a book and now you're an instant expert claiming to understand it all and anyone who doesn't bow and...

Chris and I have talked about this at length. He's tried 10W30 IIRC. In my truck, I've never noticed much of a difference in consumption between 10W30 and 15W40 and I've run both in 27 years of owning the same truck. More 10W30 than 15W40. I said this before but my money is on the valve stem...

Originally Posted By: Gokhan Perhaps you can shrug off the Cam-Shield reference but the SAE reference is quite clear and authoritative. You should read the SAE reference above carefully. It is authoritative in defining general concepts but does it address this issue directly? I.e. what is...

Originally Posted By: stro_cruiser When I spoke to a guy at the manufacturers of the Magnefine filters, he said they were rated as being closer to 25 microns. Well, I think he may be misrepresenting things a little if there is no context with his statement. I have actual tests that show it...

I've read that book too. I'll quote back part of your quote: "However, when formulating multipurpose oils for use in gasoline engines, high-speed passenger-car diesel engines, and larger diesel engines, it is necessary to select carefully between the possible ZDDP types available and sometimes...

KOUPATROOPA: Is there some context to your question? If so, that might help us give you a better answer. Yep, it really varies according to the engine, operational situation and the lubricant. I have been running oil temp gauges for years now on a couple of different engines. Ambient temp is...

Originally Posted By: Dan916 The latest I heard on the Magnefines is that many manufacturers were including it on OEM rebuilt trannies, but problems arose with leaks and defective bypass valves (!!!). Far from the latest. Most likely you are hearing misinterpreted comments on a parts...

I agree that dual rated HDEOs may not be optimal for all engines but I submit they can be optimal or nearly so for older flat tappet engines when measured against the older specifications they were originally certified under. Flat tappet engines were largely gone by the mid 1990s, so they would...

I also have a 2000 Honda Accord V6, a Coupe, bought new, and I have a Magnefine on it. I agree; the comment from the so called Honda experts is ridiculous. The screens are rock catchers at best, probably 100-150 micron mesh filters at best (I have never been able to determine). Generally, it's...

I forgot to mention that while the high detergency and dispersency additives in a diesel rated oil can reduce the effectiveness of a ZDDP package vs the package in a gas engine, but it is related to the activation temps of the product. The diesel rated oil reputedly requires a higher activation...

Originally Posted By: Gokhan For a flat tappet cam gasoline engine with moderate valve spring pressures (such as a flat head engine) the generally accepted minimum level of protection is 1200 to 1300 ppm of Zinc. Generally accepted by whom? The companies that make specialty oils for "classic"...

Originally Posted By: slingha Clevy, The Generac Manual calls for 100hr plug changes. Not sure why. Not only that, no matter what which plug you buy, the manual is specific that you have to re-gap them before installation. The regapping is a wise thing to do because the plugs can get banged...

Interesting find! Whenever I run across old owners manuals, the first place I look is at the maintenance schedule and then the oil recommendations. The '50s and '60s were an era when oils took a big jump in quality. I wonder if oil quality improved to match the horsepower race or vice versa?