I do not run 20k mile OCI but I would do it with at least 80% highway miles and a boutique oil (Amsoil, M1 AP, etc) plus an extended performance filter.
I am currently flirting with my longest OCI ever. Have a 2006 Tacoma 2.7L with 140,000 miles, runs perfect. Running M1 EP 5w30 with a PureOne filter. Currently have 6300 miles on the batch and a paper blotter drop test shows the oil is still like new, very slight ring in the center but hard to see. Color on the dipstick is like amber honey but still very clear. Thought it would be darker at 6300 miles. Thinking about going to 8000 or 9000 miles before changing... my driving is about 50/50 city/highway with plenty of longer runs at full temperature.
I am currently flirting with my longest OCI ever. Have a 2006 Tacoma 2.7L with 140,000 miles, runs perfect. Running M1 EP 5w30 with a PureOne filter. Currently have 6300 miles on the batch and a paper blotter drop test shows the oil is still like new, very slight ring in the center but hard to see. Color on the dipstick is like amber honey but still very clear. Thought it would be darker at 6300 miles. Thinking about going to 8000 or 9000 miles before changing... my driving is about 50/50 city/highway with plenty of longer runs at full temperature.
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