Originally Posted By: OneEyeJack
In my 2003 4Runner with the 4.7 V8 I use 0w-30 Red Line engine oil and D4 Red Line transmission fluid and Red Line 75-90 in the rear diff (2x4).
For the transmission I drain and refill only (4-5 quarts), every 30K and every 60K it's the diff. I suck out some P/S fluid and replace it with D4 when I do the transmission.
I change the engine oil every 10K and the Mobil 1 M1-209 (longer than stock) oil filter every other oil change. I have an oil sample ready to go right now.
The oil sample should be interesting because at 160K this 4Runner has lived a hard life, towing horses and supplies, tools and other stuff on bad roads in the desert.
I really have no idea which engine oil and filter would be absolutely the best. The more I've learned about engine oil over the years still has not brought me closer to a definitive answer for my situation. So I'm sticking with what is working but I'd be willing to bet other combinations would also work.
This Toyota V8 is a very tough engine. We use 2 of them to drive a ball mill and a water bed and a shaker table at a hobby gold mine. These engines get run 8 to 12 hours on a working shift at full load using the same fluids listed above. We use the engine, tranny and drive shaft and actually use the cruise control. These engines setups came from wrecked vehicles at very low mileage and replaced very expensive industrial engines that would have cost over $12K each. We run them on CNG and have had zero problems. The only mods are a bigger radiator with electric fans and a coolant filter and a big oil sump and oil cooler with an electric fan. One oil cooler is in the radiator to speed up the warm up and the other is separate. We also use a catch can for the crankcase and a really big air filter. The internals remain untouched along with the fuel control.
The sump has an inspection plate and there has never been any build up of sludge at all. We have a meter on the CNG system and it alarms at a certain amount of gas used and then we change the engine oil. It's a simple setup and it works.
The sump has an inspection plate? What is that?
And the 4 runners are legendary for their longevity, even the V6 models.mtheres a YouTube video of a doctor that owns a V6 4Runner with over 400,000 miles on his - he's only had to do a few minimal repairs. I'm not a huge fan of the 4Runner because of the interior, gas mileage and rough ride, but I love their longevity. They're small SUV's but they're more like a truck.