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I've mostly been using Mobil 1 HM 10w40 with good results (low wear and reduced oil consumption) and I've been assuming it to be superior to Castrol's GTX HM 10w40 by virtue of Mobil 1 being a full synthetic vs Castrol being a synthetic blend. Is that a safe assumption? I did notice that V@100c...

When I bought our 2006 Prius four years ago l sent the oil that was in it to our local Carter CAT Fluids Lab for analysis ... and the results terrified me! Crazy high levels of the wear metals Copper and Lead (potentially bearing and bushing wear). I thought for sure the engine had been...

The first oil change is supposed to be at 6 months or 6000 miles. At 7 months we still didn’t even have 2000 miles but I changed the oil and did this UOA. Recommended oil is 0w20. Subaru says if that’s not available using 5w30 is acceptable. If a thicker oil is acceptable / will not void the...

Here’s the process I used to complete a thorough Amsoil Engine Flush on our 2006 Toyota Prius with 275,000 miles on it. I also captured before flush and after flush used oil samples that I will be sending to our local Carter CAT SOS Fluid Analysis lab to answer the question: Does Amsoil Engine...

I almost didn’t cut these open because I felt super confident that they would be totally identical. Do you think this quality control problem with the only Super Tech oil filter I’ve ever cut open is a fluke? If I kept opening up AC Delco filters would I find this too? Or … is there a...

I am bummed and disappointed, but, I can't say that I am surprised. Read this conversation all the way to the end. I really pressed this technical support person. I asked them to double confirm 98% at 20-30 microns per ISO 4548-12. My guess is that the filters that do still have the metal...

This topic keeps popping up, I didn’t think it was advisable to add the GM Limited Slip Additive to a fluid already formulated for limited slip differentials - but I emailed Mobil 1 Technical Support to 100% confirm: Their reply:

I’m pretty sure this is over the top, but I combined the BITOG long storage best-practices recommendations!

I made a video yesterday comparing Purolator ONE with Fram Titanium, I decided to go with the Fram. So today I went to Advance Auto Parts - there were three FS3506 filters on the selves … and all three were different designs. This is super frustrating because you never know what you’re getting...

On paper these filters are both outstanding. The Fram Titanium FS3506 filtration efficiency is 99%+ at 20 µm, the Purolator ONE PL14006 is an amazing 99% at 17 µm! So I bought them both and cut them open to compare their construction:

I bought a new-to-me 2001 Corvette Z06, and another C5 owner said he thought the PL14006 was 99@20. I didn't think this was true so I emailed Purolator Tech support today and was blown away by the reply:

I have three old Corvettes that sometimes are not driven for a month or more at a time, especially during the winter months. I was on the Amsoil sight reading over their oil descriptions and noticed "Z-ROD Synthetic Motor Oil is formulated with a unique blend of rust and corrosion inhibitors...

Some UOAs I realized I hadn't shared: The first 9000 mile UOA was when my family super-overloaded our minivan ultimate with 3 kids, our dog, my wife and I, 5 bicycles and camping and cooking gear and we drove across and all around the country for a little more than 5 weeks. The oil became super...

I asked Russ Craighead, who led the Corvette development team for GM, through the C5 and C6 programs, and Russ also owned four C4s. Question: Hey Russ, here’s a quick question that of the people I know - you may be able to answer. When my 92 Corvette came home from being built by...

The prior owner of this car used a K&N air filter and the airbox was slightly compromised imho (see video below of problem and solution) which explains the elevated Si, but this oil seems unfazed. PQ index of just 4 is awesome. This car was autocross raced 3x during this OCI, I purchased it last...

Just bought this car that the owner modified over the last year for autocross racing - few small power mods and numerous handling mods. Owner says he's been running and racing it with Rotella T4 15w40 plus Lucas Oil Stabilizer. 1500 mile max oil change intervals. Says loads of racers use this...

I found 3 metal backed Fram Titanium filters for my Corvette locally. It may take me 3 years to use them. I discovered that they fit snugly in a 1 quart freezer bag, so I bagged them up, put them back in their boxes and I'm storing them in my garage. This way, even if my garage becomes damp the...

@OVERKILL mentioned that Titanium filters were transitioning to the unbacked synthetic blend media found in the Fram Ultra. I thought I had purchased Titanium FS3980s that were metal backed - the one I just purchased and cut open was! I was wrong. The Fram rep told me “Titanium = Ultra with a...

8 popular GM filters compared. All of these filters are very good and imho 2 are outstanding. This is the filter spec is used on my stroked LT1 383 powered 1992 Corvette (which is why I was interested in doing this comparison), and, this is a super popular filter, used in millions of GM cars...

I did a few polls in Corvette groups to see what fluids are commonly being used in ZF6 transmissions. Below is a list of the fluids people seem to be commonly using, their Viscosity at 100c and Pour Point. Lots of people are using Amsoil - which is waaaaay thinner than the 10w60 what ZFdoc Bill...