Good evening everybody, today I recently replaced the engine air filter, cab air filter, engine oil and filter, and gear oil from both differentials. I will be sending the engine oil sample to Blackstone Laboratories for analysis and early detection of any possible problems prior to a catastrophic (and more expensive) failure. Blackstone is even nice enough to send you the kits for free, they just won’t actually give you your results until you pay the $28 fee. I’ll be sure to show off my engine analysis results when I get a response in one to four weeks. I’ll also be posting some photos of the used filters and differential drain plug magnets below along with mileage change intervals.

First of we’ll start with the rear differential gear oil (last changed about 10,000 miles ago):

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I took images with and without a flash of the drain plug and what I wiped off of it with the shop towel. No water came out and there weren’t too many wear products on the magnet. Gear oil never really smells great though…

Next up, let’s look at the front differential (last changed 10,000 miles ago):

The truck is normally in rear-wheel drive so the front differential put very little on the magnet and the oil looked almost new.

Let’s move onto the engine air filter (once again, 10,000 miles):

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All of those desert trail miles made themselves very well known with all of the dust I beat out of the filter. The cabin air filter told a similar story:

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Last but not least let’s talk about my engine oil sample and draining the filter. When you buy a new filter from Toyota for the 5.7L you receive a drain plug to push into a valve in the filter housing. It always takes a little time for me to get it in their right but it’s much better than just yanking off the filter housing and having oil go everywhere.

I pulled a big-brained move and almost let all of the oil drain out of the pan before remembering to grab my sample bottle. Here’s what the kit looks like after you remove the packaging and take the sample:

I opted to type and print my oil slip rather than writing on the supplied paper to avoid any penmanship issues. The recommended oil sampling procedure may be found on Blackstone’s website but they’re fairly simple. As I said before I’ll be sure to report back on my engine oil results. That’s all for now folks!