Hey guys, I'm running a 1999 RX300 AWD with 185k miles on it. My family's owned it for the better part for 10 years, and most of it's miles have been highway miles. Now that we've got a brand new RX400h as our ski trip hauler, I have purchased the RX300. It's a great car, no complaints. It has come to my knowledge that these cars are very prone to "sludging up". To my knowledge, regular oil has been used up till very recently. I drive a very limited route - just to work and back for the most part - on average 10-15 miles a day. Is there anything I should look out for? Is there any way I could check for sludge buildup?
