Old school

I've been putting 6.5 quarts at each change. This will bring it to the full mark exactly. Don't over fill. If you are using quart bottles they should be marked. If you are using bulk, go to Walmart and get a cheap glass measuring cup.

Are these factory CD's or burned at home?

Not sure about the engine compartment cover, but as to the timing belt, I found this: Timing Belt (except GS 300 and IS) Replace every 90,000 miles or 108 months. A qualified technician should perform this operation. (The GS 300 and IS are equipped with a timing chain, which requires no periodic inspection.) Here: Owner's Manual Scheduled Service PDF On this thread: Owner's Manual downloads IMHO, all vehicles should be manufactured with timing chains, rather than belts, but there is that whole 'planned obsolescence' thing that makes the dealers so much money. Cheers!

How do I remove the Inner (closest to the engine) screw that attaches the side engine compartment cover? The other fasteners are the push through type. Manual says to turn the single screw type fastener counter clock wise and that will loosten the fastener but I am unable to remove the cover from that point. Second question. The salesman that sold me the car said that the car did not have a timing belt. True or false?

Yes! There is a difference. I also have a RWD and was issued an AWD filter element by the Lexus parts manager last year. Upon checking the box before I paid for it, I discovered it had addition hardware that I didn't receive for my prior oil changes. The parts manager quickly realized he had given be an AWD filter element and swapped it out. Not sure where the extra o ring goes or whether or not the filter elements are different. I'd just insist on getting the right part for your car.

My oil filter kit that I bought at Lexus has only one "o" ring. The "pinned" how to oil change in this forum shows two "o" rings. My IS 250 is RWD and the car shown for example is AWD. Is there a difference in oil filters for these two models?

I've been changing oil my whole life. Where is the oil drain plug on my '08 IS 250 and what tabs are they referring to on the filter box? I'm sure it's simple, just never owned one before.