Date: Sun, 16 Sep 2007 08:18:56 +0100 From: johannes <johsnospam3764564-efitter.com> Subject: Re: 9-5 questions on engine oil
"Charles C." wrote: > > Hi, > > A friend bought a 9-5, 2.0 LPT, year 2000, with 133k miles on it. > > The oil - the little bit I can get on the dipstick - looks suspect for > dryness/smokiness (sludge?). Level is low .. the car has gone > unserviced for 16k miles. Supposingly it is on fully synthetic. With > the engine fully warmed up I can hear the top end (hydraulic valve > lifters/pushers ...). > > Question 1. Is it safe to flush the engine (my franchised dealer does > it to my 9000 every year)? > > Question 2. Temporary fill. Toying with the idea of filling with a > mobil 10-40 semi-synthetic which I have (and which I found too thin for > my car I could hear the chain with it but not with SAAB's own oil). Put > new filter. Run the car for 200 miles or a week then drain. Flush again? > > Question 3. What do I put in it next? (assume some wear on the top > end). Fully synthetic 0-40 Mobil 1, Shell does one at 5-40. Semi > synthetic 10-40 (probably Castrol) or tell him to take it to the dealer? :-) > > Question 135. All but one of the services were by SAAB franchised > dealer(s). The one that was not says they put synthetic oil. I am kind > of aware of the debates about leaking seals on older cars when they are > filled with fully synthetic oil for the first time (assuming it has run > on semi-synthetic before). Should I tell him to use fully synthetic? > (I personnel use semi on mine and change it twice a year with total > mileage less than 9k per year). > > Any comments appreciated. > > Regards > Charles > > 9000, 2.0 lpt, 1997, 103k miles. > > -- > Please remove _removeme_ to reply. I use Halfords 5W/40 fully Synt for my 9000. Why? Because they sometimes have BOGOF offers near public holidays. The first number 5W is good for cold winter starting, the lower this number the better. The W letter actually stands for "Winter" from the days when people changed oil for the season. The only snag is that the larger the multigrade range, the more additives they have put it. And additives can wear off, thereby reducing the lifespan of the oil, though this is hearsay and probably not important as I change oil at 3000-4000 miles. But oil types is a long discussion; don't confuse multigrade with multi- viscosity. The point of multigrade is precisely to reduce the viscosity variation with temperature. A uni-grade oil will have a large (standard) viscosity change with temperature, the 'grade' definition goes back to the 1920's.