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I'm really behind the curve on this. Can you guys confirm that the 40 grade HDEOs DID NOT drop the ZDDP below 1000 ppm, even though they may have an CK-5/SN API label? It appears so.

Filter efficiency is directly and primarily controlled by the media, but not the amount of media. The velocity of flow has a small effect on it and my recollection of the primary material I read about it years back was that lower velocity tended to nudge the efficieny up. As I recall, it was by...

I'm with the oversize crowd when it's practical and cost effective. For the reasons of lower differential pressure, capacity (for long OCI or FCI) and the slight increase in efficiency. I am wracking my brain to remember the paper I read on that years ago. Maybe BrocLuno knows, since he brought...

Combines probably have it worse than tractors for dust around here. Harvesting soybeans is the worst. Mine, which recently caught fire and burned to the ground, had a dash indicator as well as a Donaldson restriction gauge, would need service a couple of times a season. It had a cyclonic deal on...

Originally Posted By: Garak Originally Posted By: Jim Allen The other thing about oil baths, if you let the oil get down just a few millimeters, efficiency drops like a rock. Let it get muddy... efficiency drops like a rock. That's why they recommended DAILY air filter service in some cases. The...

Originally Posted By: preaction I was at a military transport get together this weekend at the Sussex county fairgrounds in NJ and there were 2 M37's and there growing on me. It was the first time 27 years I have seen a M198 towed 155mm howitzer a system I was a mechanic for while in the...

Originally Posted By: preaction Jim, thanks for the reply I appreciate it and yes its a 47 WDX PW and I drive it every chance I get so I would like to see it stay that way for a very long time. Wow! The legendary Power Wagon! That was just a WAG on my part. Anyway, how I made my air filter...

Originally Posted By: BrocLuno Gee, that's funny. They are very few tractors out in the fields with paper filters. They run in clouds of dust and most all run oil baths, with a cyclonic pre-filter. Oil baths take vertical space by design. They would not fit under the hood of most 1960's cars...

I have three SAE papers from various eras that list the maximum efficiency of the average oil bath air filter at 80-85%. One from the 1920s touted 50% efficiency!Some of the cyclonic filters in tractors (HUGE) got over 90 percent. At the time oil bath filters were replaced industrywide...

Oh, come on Chris! That 2500 mile recommendation was for '87 oil! And if your original book probably shows API /CD oil. [censored] compared to today's HDEO, hence a lower OCI. Some of my old UOAs are probably on here somewhere and I went as high as 8K miles (with a bypass filter) and 5.5K...

Somewhere on this site from years back is a UOA of oil that sat in the crankcase of a tractor for 30 years stored in a barn (a dry climate area). It was suitable for use.... even though the analysis showed a modern oil would be a MUCH better choice. Also, go to the Blackstone site and they have...

Saying not to bother is very bad advice in the long term. I'm 100% with Ihateautofraud above. Don't be lazy. Drop the pan. Install the magnet. If you took your car to a shop and the tech forgot it, you'd rightly demand the owner do it right. YOU owe YOURSELF the same quality work. Not having...

Bought some for the Uplander. The fit is beyond horrible. Really sucks! Would like to have sent them back with a small jar of Vaseline but decided to make them fit using filler material because of the HEPA aspects. I used these to replace Fram CAF, which fit perfectly. If my wife didn't have...

Originally Posted By: ZeeOSix If a cellulous filter "absorbes water" on short trips, the first time the engine is driven a decent distance at full operating temperature, all the moisture absorbed in the filter is going to be "boiled off" and removed. Result is wavey pleats. And the media can...

Originally Posted By: goodtimes Originally Posted By: Jim Allen Originally Posted By: goodtimes My two cars I service, still doing even at this point in life, are easy to change the filter on. New filter every time with fresh clean media is what I want. Graph supports this. I want the least...

Originally Posted By: Patman Look at it another way, there are people doing 10-15k OCIs and they leave the same filter on for that entire time. So what's the difference if you're doing 5-7.5k intervals and only changing the filter every other change? Good point! Many premium filters now have...

Originally Posted By: goodtimes My two cars I service, still doing even at this point in life, are easy to change the filter on. New filter every time with fresh clean media is what I want. Graph supports this. I want the least restriction everywhere in the oil filter. The notion large pores...

Blue, it's your prerogative to maintain your car any way you like. Nobody is telling you how to think or what to do but you have already expressed your opinion several times, without, I might add, backing it up with much in the way of empirical or factual evidence. OK we get it, you have that...

Originally Posted By: BlueOvalFitter Some of you state that an oil filter gets more efficient as it builds up sediment/dirt/particles/etc., in the filter media, right? "WHAT IF" you leave an oil filter on for multiple OCI's, and it builds up so much that it's going into by-pass mode all the...

Like everything else, this is not a "one size fits all" situation. The only way to know for sure is to have a differential pressure setup on your oil filter. I did at one point on a now-sold truck and those experiences validated what I was told by engineers from several companies that the...