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I'm interested in what type of oil and filters some others are using in their high-performance pickup diesels. Terry is helping me greatly to get the wear metals down in my Duramax, but I'm just curious about the subject. My Duramax is running approximately 400 RWHP as a daily driver, and...

Can anyone help me source Donaldson filters? My local parts stores either have no idea what I'm talking about or want $16 per filter with a minimum order of 12. The part # I need is P550518. Thanks for the help!

Here are the results of my first-ever UOA, and I need some help interpreting the results! I sent another sample to Blackstone and am having Terry Dyson offer his advice, but this sample was done by Staveley Fluids Analysis. (This is NAPA oil analysis lab.) 9633 miles on oil 19670 miles on...

Has anyone used NAPA's oil analysis service which sends the samples to the Atlanta Lab? I'll be doing my first ever oil analysis, and my local NAPA dealer sells these kits. He's a great parts guy, and says he's had very good luck with these kits. Also, if I don't have the actual sample bottles...

I'm currently using Delvac 5-40W in my Duramax, but I'm considering trying something else to see if oil consumption goes down. I'll be sending my first sample of Delvac in for analysis shortly, as it has about 9,000 miles on it right now. Not counting make-up oil for a filter change at 5,000...

I'm running a Grasshopper commercial lawn mower this summer with a 28 HP Kubota diesel. The owner's manual states that I should be using a CD or CF type oil in 10-30 or 10-40 grade. Since these specs are obviously outdated (the manual states that any more current rating is also acceptable)...

Is anybody successfully using the SHC series in a GM G80 rearend such as those found in 2500HD pickups? I'm having zero issues using the Mobil 1 "regular" formula, and I see no reason to switch. I'm just wondering if anybody is using industrial-type E500 spec lube without damaging the G80.

My Duramax has never used ANY oil since the day I drove it home. I realize that all engines use some oil, but I'm refering to oil consumption based on visually checking the dipstick. I'm running Mobil Delvac 1, and after a recent 2500 mile trip to California, I've confirmed that I've lost...

My '04 LLY Duramax engine uses EGR even though it is a federal emmisions truck. A lot of guys are disconnecting, blocking off, etc., but this is opening up a huge can of worms because then you get into warranty hassles and engine diagnostic codes. Also, some are reporting poor fuel milage...

I think I've finally settled on using Amsoil in my new Duramax after about 10,000 miles using Mobil 1 1300 15-40 for break-in. Since Amsoil doesn't make a 5-40, I'm thinking about using their AME 15-40 during warmer weather and HDD 5-30 during colder weather. Is this a good plan, or is switching...

If you read my post under the "Diesel Oil" section, you know I've got a new Duramax I want to take care of. I've done searches, but I'd still like some current feedback as to what the real story is with fuel additives. Are they beneficial in a diesel such as this one? Power Service is always...

I recently purchased an '04 Chevy with the Duramax diesel in it. I want to treat it right, which is why I'm asking questions here. Forgive me if this is a little long, but I'm anxious to learn! 1. A local dealer swears up and down that these engines come from the factory with Mobil 1 Delvac...

Hi, I need to change the rear differential fluid in my '03 Chevy 2500 HD pickup with a locking rear diff. GM calls for synthetic 75-90W, part # 12387216. I would like to use Amsoil 75-90W, either, preferably the Series 2000, but I can't find anywhere on the Amsoil website that it specifically...

What is the "correct" method of breaking-in a diesel, such as a Duramax in a pickup? I've heard all the angles on this issue--pull a heavy load to really "run" the engine in, go really easy on it, run it hard, do nothing special, etc. Opinions?

I've always tried to use one brand/formula of oil and stick with it throughout the vehicle's life. Is this stupid? Will it hurt anything at all to switch oils after draining the old stuff? Also, I've posted some other questions concerning a 6.0 Chevy gas engine. As stated in those questions...

Currently, I'm using Amsoil Series 2000 0-30W in this engine with an Amsoil SDF 32 oil filter. Is this a good filter, or are there better ones out there? I plan on doing some oil analysis, but for now is this a respectable combination?

I'm new here, and I really appreciate all the collective knowledge! I would like to know your opinions on the best air filter for the engine listed in the description. I was all ready to run out and buy a K&N, but they don't look quite so good anymore. My main concern is keeping this engine...