Th subject of what oil and what filter can get pretty personal. Most oil companies want you to believe that their oil and their branded filter is best. The heart of the discussion boils down to synthetic vs generic. Most of the major brands are made from the same base stocks, the differnces are the additive packages and the bottle and of course the price. I would rather see someone use a cheaper oil and change it more often then the other way. If you calculate the price of the oil used for extended changes against "ordinary" oil you will see extended changes cost more! Over the road trucks run on extended oil schedules but they for the most part use oil analysis to determine oil and additive life. Under normal circumstances the additive package wears out before the oil starts to break down or the oil becomes overloaded with products of combustion. For most owners of Deloreans a change of once a year is probably less than 5,000 miles. Use a national brand of multi-weight oil and change the filter at every change. Synthetic oil is expensive overkill and unless you watch very carefuly someone could add something that is not compatable at a gas station! The same goes for DOT 5 silicone brake fluid. You lose all advantages if you mix DOT 4 with DOT 5.(As if there are any?) If you are like most owners they try to do at least some maintaince like an oil change. If you figure the price of oil and a Purflux filter it is still cheaper if you do it yourself than going to a gas station. Never overfill. The best way to check oil is in the morning before you start the car on level ground. It should NEVER be over full or below add. Always dispose of used oil properly. With the new oil additives that are in modern oils you should try to avoid direct skin contact, some people are very sensitive to them. Wash immediatly if you do come in contact especially with used oil, that contains heavy metals. David Teitelbaum vin 10757 --- In dmcnews@xxxx, Delorean17@xxxx wrote: > Hello List, > The Amsoil SDF42 oil filter also has the anti-drain back valve. They > are pretty expensive but worth it I think. I also bought an amsoil life-time > air filter and will probably put Amsoil oil in my car at the next oil change. > I believe it is $9.50 per quart.(25,000 mile) Does anyone on the list use > amsoil in there car? Is it really safe to go 25,000 miles if you keep > changing your filter? > > later > David