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The oil I had used before was Valvoline OW-20. Anyone know if they use sodium as an additive? Looks like people aren't a big fan of the K&N's.

Originally Posted By: HTSS_TR I would change out the K&N air filter to OEM Toyota air filter, K&N filter is known to pass dirt into the engine. NAPA gold oil filter is good for 10k miles or more, another good oil filter for 10k miles is Purolator Pure One oil filter. Amsoil and with either NAPA...

This is my first UOA ever, and I'm pleased with the results. Air filter is a K&N factory replacement filter. I went with NAPA gold oil filters, changed every 5K. 1/2 quart of makeup oil added. My goal was to see if a 10K interval was fine for this car. Put the oil in in July, and drained it...