 |
 | Home | Contact Us | FAQ | Search & Site Map | Link to Us |
 | Sign In | Join | Other 45 Sites in Network |
Car Forum / Saab Cars / June 2005Synth Oil Chg Interval on a Viggen?
I have a '00 Viggen with 30k that I've been changing every 3k with non-synthetic Castrol but I've been thinking of converting over to Mobil 1 synthetic. What is a good oil change interval with a pure synthetic like Mobile 1? > I have a '00 Viggen with 30k that I've been changing every 3k with > non-synthetic Castrol but I've been thinking of converting over to Mobil 1 > synthetic. What is a good oil change interval with a pure synthetic like > Mobile 1? I change it every 5k on my cars, I've been pleased with the results. > I have a '00 Viggen with 30k that I've been changing every 3k with > non-synthetic Castrol but I've been thinking of converting over to Mobil 1 > synthetic. What is a good oil change interval with a pure synthetic like > Mobile 1? I mainly look at the colour of the oil. These days I do a lot of motorway driving which is less demanding. I use the cheaper Halfords 5W40 fully synt and change at 4k miles. Then I use Shell Optimax petrol which I believe is good for the engine. > synt and change at 4k miles. Then I use Shell Optimax petrol which I > believe is good for the engine. "Good" - in what way? Cheers! > > synt and change at 4k miles. Then I use Shell Optimax petrol which I > > believe is good for the engine. > > "Good" - in what way? > > Cheers! High octane petrol. Although knock sensor is working, it has to do less work. > > synt and change at 4k miles. Then I use Shell Optimax petrol which I > > believe is good for the engine. > > "Good" - in what way? Higher octane and claims to have better quality cleaning additives to keep your injectors working nicely IIRC etc..... Graham >> "Good" - in what way? > > Higher octane and claims to have better quality cleaning additives to keep > your injectors working nicely IIRC etc..... Higher octane is ok, but about cleaning additives: Shell Optimax is only good for ONE thing: Making money for Shell. ALL petrol has cleaning additives. Shell is only putting 3 times as much in. But for what? Your car is already running very clean... Cheers! > >> "Good" - in what way? > > [quoted text clipped - 7 lines] > > Cheers! Higher octane is better. I find that my 9000 CSE LPT will sometimes cut out if I accelerate very hard on regular petrol. But this does not happen with Optimax or other high octane. > Higher octane is better. I find that my 9000 CSE LPT will sometimes cut > out > if I accelerate very hard on regular petrol. But this does not happen with > Optimax or other high octane. Saab's and most other cars run fine on regular unleaded. If you have a high pressure turbo (over ~8psi/.5Bar) then you start needing higher octane. Saab even touts the fact that their turbo cars don't need high octane gas (save Aero/Viggen/HOT). >> Higher octane is better. I find that my 9000 CSE LPT will sometimes cut >> out [quoted text clipped - 5 lines] > even touts the fact that their turbo cars don't need high octane gas (save > Aero/Viggen/HOT). That may be, but the engine management of Saab turbo cars since APC came in in the mid-80's, will take advantage of octane that you give it. It doesn't _need_ it; you won't damage the engine with low-octane fuel, but you _will_ get more boost (and therefore horsepower) with higher octane fuel. Been that way for Saab for about 20 years now. > >> Higher octane is better. I find that my 9000 CSE LPT will sometimes cut > >> out [quoted text clipped - 11 lines] > but you _will_ get more boost (and therefore horsepower) with higher > octane fuel. Been that way for Saab for about 20 years now. The nice thing is that it does it automatically. My previous car with a Bosch Motronic engine management had an octane selector uder the hood. You could set it to 85 or 88 RON depending on your choice of fuel. Graham > Saab's and most other cars run fine on regular unleaded. If you have a > high pressure turbo (over ~8psi/.5Bar) then you start needing higher > octane. Saab even touts the fact that their turbo cars don't need high > octane gas (save Aero/Viggen/HOT). Saabs will run on regular, but they aren't as much fun, at least the turbo's aren't. The engine management adjusts to the lower octane by cutting back on the zoom-ability. I run mid-grade around town. Put premium in for long trips or if I'm getting bored. > > Higher octane is better. I find that my 9000 CSE LPT will sometimes cut > > out [quoted text clipped - 5 lines] > even touts the fact that their turbo cars don't need high octane gas (save > Aero/Viggen/HOT). Well, the car runs fine on regular, but I notice the difference when I push it to the limit of the rev range, though this is only done for curiosity reasons. But then high octane is definitely better. Saab may not need high octane petrol in the sense that the anti-knock system protects the engine. >>>>"Good" - in what way? >>> [quoted text clipped - 11 lines] > if I accelerate very hard on regular petrol. But this does not happen with > Optimax or other high octane. It should never "cut-out" due to low octane. It should just drop back to base boost, but that may be what you are feeling. -Fred W > >> "Good" - in what way? > > [quoted text clipped - 5 lines] > additives. Shell is only putting 3 times as much in. But for what? Your car > is already running very clean... Do you have a cite for the *quantity* of additive in Optimax. ISTR that Shell claimed it was using more refined additives with fewer by-products or something similar. Graham >> Higher octane is ok, but about cleaning additives: Shell Optimax is only >> good for ONE thing: Making money for Shell. ALL petrol has cleaning [quoted text clipped - 7 lines] > something > similar. No, only 6 years of working inside the oil-industry in Denmark. ;o) Cheers! > I mainly look at the colour of the oil. Why? A good oil with effective detergents will turn black after a relatively short distance. A bad with bad detergents will, compared to the good oil, look more or less as new. With a good oil you can not determine when to change the oil just by looking at its colour.  SignatureG?ran Larsson http://www.mitt-eget.com/saab/ >I have a '00 Viggen with 30k that I've been changing every 3k with >non-synthetic Castrol but I've been thinking of converting over to Mobil 1 >synthetic. What is a good oil change interval with a pure synthetic like >Mobile 1? Saab clearly says to only use fully-synth oil. SignatureM.v.h. ------------------------------------- Livet er for kort til lange overhalinger > I have a '00 Viggen with 30k that I've been changing every 3k with > non-synthetic Castrol but I've been thinking of converting over to Mobil 1 > synthetic. What is a good oil change interval with a pure synthetic like > Mobile 1? Why oh why are you using non synthetic oil in a Saab engine ? Saab *specify* the use of synthetic oils ( both semi and full ). Synthetics have a far better 'lifetime'. I hear that this 'old fashioned' approach to lubrication is rife in the USA where you have many 'lube shops'. Not that there's anything wrong with regular oil changes - it's just not necessary with modern oils. Consider your driving. If it's mainly short runs, change the oil more often. If it's long runs then the oil isn't likely to be contaminated by dirty by-products so much. I would have no problem with 12k miles on synth on regular long runs. Graham > I have a '00 Viggen with 30k that I've been changing every 3k with > non-synthetic Castrol but I've been thinking of converting over to Mobil 1 > synthetic. What is a good oil change interval with a pure synthetic like > Mobile 1? Whatever posessed you to use a non-synth oil at all ! I thought Saab says it's strictly 'verboten' ? Graham >> I have a '00 Viggen with 30k that I've been changing every 3k with >> non-synthetic Castrol but I've been thinking of converting over to Mobil [quoted text clipped - 5 lines] > it's > strictly 'verboten' ? I bought it at 28k and it had Castrol. I've switched to Mobil 1 since then. Am probably going to change every 6k. |
Reply to this Message |
 Sign In
 Join
 My Latest Posts My Monitored Threads My Blog My Photo Gallery My Profile My Homepage Start New Thread Enable EMail Alerts Rate this Thread
|
©2008 Advenet LLC Privacy Policy - Terms of Use
This website includes both content owned or controlled by Advenet as well as content owned or controlled by third parties.