NEVER!
Until now. I bought the car in January, 2004 and changed the oil the next day. It was Mobil 1 5w30, [my dad took it to the mechanic]. That was before I encounter LOC, I didn't knew a bit about cars back then, [according to my records, last owners used 5w30 also].
Now, right now is my summer break so I get up late in the day. My dad noticed oil underneath the car[on the garage floor, thats its crib] and took it to the mechanic early in the day.
I looked at the bill and it said Castrol Motor Oil 20W50. First of all, I want it to be Mobile 1 and 5w30. So, I called him and he said he has old trucks and cars with more than 200k miles and thats what he uses. So, thats why he put that in. It is not sythetic neither, he said the advantage of using sythetic is that you can go over your oil changing miles [couple of hunderd] and don't hurt the engine. I changed it after driving 1,200 miles and will be in the future. So, he said you change it frequently so, you don't need to use sythetic.
I only drove the car about 5 miles after the change of 20w50.
Now for the real stuff: Is it going to hurt the engine?
Is it going to go back to normal after I change it back to 5w30 in the next oil interval?
Should I ask him to change it again? Because it is his fault! You think that will make him mad?:whistles:
He has done work on our other cars and does a good job for less $.
I don't think he is an idiot but I guess he just thought that he has to think for my Dad, since my dad doesn't know crap about Lexus or any other car for that matter!!!!!