Oil issue Saab 9-5 Aero 2002

[cjcposh]

Hello,
Ive recently had the sump dropped,strainer and pipe cleaned and sump "desludged".The mechanic put in Semi-Synthetic oil as he stated an older engine (172000 miles in my case)would run better on it than fully synth.Is this true as most info suggests only Fully synth should be used in Aero's.Would be grateful for any info.

[Slade Alive]

Just go Mobil 1 then you don't have worry, nor research debate or argue the point ever again.

[spaceship]

Slade Alive said:

Just go Mobil 1 then you don't have worry, nor research debate or argue the point ever again.

Haha. Have you been posting elsewhere on this forum?

As for the OP's original question - according to the forums you really should be putting in Fully-Synthetic.

For an engine with higher miles, i.e yours, you should go for 5w-40 Fully Synthetic as it will help your engine run quieter and smoother. Failing that, go for 5w-30 Fully Synthetic.

Mine is currently running 5w-30 and at it's next change - in about 4 months, I will switch to 5w-40.

So, if I was you I'd get a new filter and some fully synthetic in it. It doesn't really matter whether it's an Aero or not. The only difference was that the Aeros were ran on Fully Synthetic from the factory so didn't suffer as badly from the blocked strainer.

Hope that helps.

[Slade Alive]

It does matter that it's an Aero. Higher performance, bigger turbo / BHP etc generate more heat - more so given Aero's get driven harder. Mobil 1 has a higher tolerance to heat fail than probably any other readily available oil, and heat is the ultimate killer of all oils.

Just a heads up

[spaceship]

Slade Alive said:

It does matter that it's an Aero. Higher performance, bigger turbo / BHP etc generate more heat - more so given Aero's get driven harder. Mobil 1 has a higher tolerance to heat fail than probably any other readily available oil, and heat is the ultimate killer of all oils.

Just a heads up

I was just meaning that you should use fully synthetic whether it's an Aero or not.

[cjcposh]

Thanks for the advice chaps.I'll get it changed asap.Possibly to Mobil 1.

[Slade Alive]

spaceship said:

I was just meaning that you should use fully synthetic whether it's an Aero or not.

You're absolutely right, not that I'm an expert, but I do agree with you.

If I had my way I would ban semi synthetics. Snake oil to make money. Even worse that the motor industry recommends the stuff in support of oil companies.

That said, the market is saturated by cheap fully synths now which are little if any better than high end multigrades. Trying to work out which is best is not as simple as it should be. It's made worse by the factors stocking what they can make better profit on, which usually comes down to one or two brands, neither of which are right (or as good as required) for the vehicle.

[cjcposh]

Mobil 1 15/50 F/S has been recommended to me.Suits the turbo apparently.Has anyone used it?Mobil 1 seems to get the plaudits.

[Slade Alive]

I didn't mention it earlier so as to avoid rubbish for stepping outside of manufacture recommendation, lol.

Yes use Mobil 1 15/50 motor sport / racing formula. I've used it in all my Aero's and others too.

[Mark in Ireland]

Any fully syth oil will do, no need to pay top price, I buy cheapest on offer oil whenever I see it, just change your oil evry 5-6000 miles with a new filter. Mostly it consists of Halfords Track oil when on special offer.