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: sludge



spitfire
03-07-2010, 03:55 AM
This may not be a new item for the Fourm but it is new for me.

Given the amount of discussion about engine sluge problems and dodgy PCV system, does this apply also to the more recent diesels, specifically the 1.9 Tid engines, or are they immune?

Also, are there any other suspect aspects of the diesels which need to be looked out for?

Paul B
03-07-2010, 07:00 AM
Engine sludge was an issue on the 2.3 petrol engine but can be avoided by using fully synthetic oil. Same goes for the diesel, use a synthetic oil that meets Saab specifications and sludge won't be an issue. The major thing that upsets the new diesels is short journeys, particularly stop start ones. Make sure you put in the km and ensure that the car is fully warmed and runs for at least 20-30minutes at constant rpm above 2000 to allow the EGR and DPF to do their work. There are links elsewhere on Saabscene to TUV & AA reports highlighting this issue on Euro IV compliant engines regardless of manufacturer.

spitfire
03-07-2010, 11:56 AM
Thank you Paul for that and I shall take on board all of your very precise recommendations as I am going down the diesel route for my next vehicle. However, I think I shall shorten the oil change intervals from what I understand to be 18k miles to probably around half of that. Even though synthetics are not cheap, they are cheaper than engine re-builds!.

I am aware that, contrary to common opinion, 'diesels' deserve at least as much if not more tender loving care than 'petrols'. Living in France where I would guess 75% of vehicles are diesel, I have often wondered how the cars survive here, especially given that so many are womens' shopping and school run cars, not to mention the retired and often doddery farmers who persist in driving at 25 mph! Indeed, it has to be said (even ignoring the crazily high second-hand prices) the way they are driven here does not endear one to even think about buying a 'used' car.

Just one other item. There used to be a lot of 'diesel' talk about the phenomenon of cylinder bore glazing due to too much low speed running. Is that now something of the dim, distant past, or is it still an issue of some concern?

quinophex
03-07-2010, 12:25 PM
Oil change frequency isn't much of a worry on a 1.9 as I've not yet known of one to have problems with oil changes every 18k, what I would say is that the cambelt service should be done more like every 50k and should always be a complete belt, roller and water pump kit as the belt is a bit of a weak point (although, belt failure shouldn't be terminal). I'd also make sure you have a budget on hand for a new egr valve and inlet manifold as they will most likely need replacing once in the cars lifetime.

spitfire
03-07-2010, 01:52 PM
Oil change frequency isn't much of a worry on a 1.9 as I've not yet known of one to have problems with oil changes every 18k, what I would say is that the cambelt service should be done more like every 50k and should always be a complete belt, roller and water pump kit as the belt is a bit of a weak point (although, belt failure shouldn't be terminal). I'd also make sure you have a budget on hand for a new egr valve and inlet manifold as they will most likely need replacing once in the cars lifetime.[/b]

Thank you again 'quinophex'. As with Paul's recommendations, I will take on board all you say and keep a careful watching brief. Going back to previous exchanges, I have completed a very detailed history and taken an few photos. These should be winging their way shortly.

Rod E

AL900S
03-07-2010, 03:03 PM
Hi

Noticed that you are in SW France - I lived in Pau for a year and then moved North to Lille for a further 5. Whereabouts are you? I never saw many Saabs in France mind you that was early to mid 90s! It might be an idea to ring round and find out dealer labour rates and maybe try to unearth a non-main dealer Saab specialist? In the North, you could always nip over to Belgium for a good deal on a car and for 'essence' :)