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I see some folks getting very excited about it.
I just don't believe that the oil wieght for a new engine is optimal when its older and the running clearances are not factory tolerances any longer.
My 95SET, with the rip option :), was on Castrol synthetic 10W30, and Valoline when it was available to 106000 miles. Then with the leaking rear seal, I found that the Mobil One 10W30 leaked out the rear seal a lot less than the Castrol 10W30, which had reverted to Faketec (tm) by that point in time. I ran with the Mobil One 10W30 for a year I guess, then tried the Delvac One that I had on hand for the TDI engine. So then from the first I noticed that change. No large interval involved. So no harm possible if others want to try a heavier oil, perhaps with mature engines they will find some beneifits. If not, no loss.
The interesting part of the comparision that I saw, was that these were both Mobil full sythetic products. And Mobil One 10W30 is widely viewed as a benchmark.
What I am telling folks is that you don't need a multi million dollar lubrication study. Just change the oil and hear and feel the difference. Now we are incontrol. Its not invisible and we don't have to be influenced by the conficted motives of the owners manual or the oil marketing companies. You can evaluate these things for your self, at least in a mature engine. We can be in control.
Then there are the reports from Europe of HP gasser engines where specs changed as cam lobes were scuffing with thinner oils. Ditto for the highspeed diesels. So why if these engines are spec'd with such thicker oils in Europe, should we stick to API 10W30? Just because if this is spec'd the new-engine EPA gas milage data would be impacted. So is it strickly the customer's interests which are in SaabUSA's and GM's mind when they spec 10W30 or 5W30 or 0W30? That is not believable.
My single observation with my 95SET is nothing more than a single data point. Not a truth for the fleet, but a truth for my vehicle. Your lifetime of success with 10W30 is the same, not a universal truth. Others can take our observations, look at failures with the NG900's, look at the current factory fills, and the recent recommeded oil weight ranges with the latest production of the classic I4 and see that there is some movement towards xW60 equiv synthetic oils. BMW went to 0W60 for one reason, there were wear failures with thinner oils.
If you try a thicker full synthetic oil and your engine is quieter, smoother and you get better MPG's, then there has to be less wear, and thats a good thing*. With a newer engine, you are probably then still getting less wear, but a new engine's running clearances may very well not allow for a perception of a smoother quieter engine.
Anyone who disagrees will have to state that the thinner oil with more fuel consumption and noise and vibration is exibiting less friction and wear.
TG, why not go out on a limb and try a 0W40 or 5W40. See for your self. Are all of your current Saabs low miles now?
As for the 5W generating the fuel savings. My obervations are for my daily commutes, resetting the SID at highway speeds with fully warmed up engines**. So at those temperatures, the effects of 5W VX 10W should be very well marginalizings, would you not think?
**This way I eliminate the effects of engine warm up and the variations in city traffic from day to day. So my data is effected by intake air temperatures and winds etc. It is interesting that the 9-5 Aero is very steady with temperature changes compared to the T5 95SET. Same cross wind sensitivity as the 95SET, but better MPGs on the highway overall. Really hard to believe. I saw this with 9-5 loaners in the past too.
posted by 65.68.101...
, Thu, 6 Feb 2003 00:19:07
, Sun, 2 Feb 2003 02:07:41, Sun, 2 Feb 2003 14:41:10, Sun, 2 Feb 2003 02:37:16, Mon, 3 Feb 2003 14:56:52, Tue, 4 Feb 2003 00:33:52, Tue, 4 Feb 2003 14:25:52, Tue, 4 Feb 2003 00:30:27, Tue, 4 Feb 2003 14:15:30, Wed, 5 Feb 2003 01:54:15, Wed, 5 Feb 2003 01:34:57, Tue, 4 Feb 2003 01:46:13, Wed, 5 Feb 2003 07:28:31, Wed, 5 Feb 2003 07:31:50
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