Wrong engine oil used, what are the consequences?

All used engine oil smells horrible and doesn't do your skin a lot of good if you get it on your hands - so you can't deduce very much from that.

AIUI, the difference between 5W40 and 15W40 is that 5W40 flows slightly better at very low temperatures - and thus lubricates your engine better when you first start up from cold. But this is only significant at *very* low temperatures - 15W40 is ok down to about minus 10degC.

Your engine is probably getting a bit worn - how many km has it done from new? Oil consumption of a litre per 5000 km is a little high for a modern engine, but by no means excessive. [A few years ago, this would have been considered commonplace]. It is highly unlikely that you have your damaged your engine by using the wrong oil.

If, as you suggest, torque is poor at low RPM, it's possible that some of the valves are burnt or not seating properly. It would be a good idea to perform a compression test - since you can also then check for worn piston rings. [If the compression test gives a low reading, squirt some oil into the cylinder through the plug hole and re-test it. If the reading dramatically improves, the pistons and/or rings are worn. If the oil makes no difference, the valves are at fault - and will need to be replaced or re-seated.

HTH.

The ticking is more likely due to a cheap oil filter which is allowing the oil to drain out of the engine over night. Volvo and good pattern filters have the anti drain valve. Start there with that problem.

In the UK, 15w-40 oil is recommended for most temperature ranges. I use it in our 2.5 10v, and did so in our previous 2.0 20v 850 which covered 110,000 trouble free miles. Perhaps the 15w rating is alittle thick in winter- though its rarely below freezing for any number of days.

What is more important is that the oil is of the right quality. This is nothing to do with the viscosity range. Use the best quality you can find- not sure what the german index is- possibly the "G" rating- G for gasoline. Currently the best available is G6.

Tim..

Thanks for the reply.

Ok, this is good to know.

This is good to know too because the temperatues did not drop below minus

10degC last winter in Holland.

The car has made 164.600 km (~100.000 miles)

I'm not 100% sure about the poor torque at low RPM. That is because I don't have another volvo 850 to compare with. The situation is as follow: here in Holland the maximum speed in urban areas is 50 km/hour. So, when traffic light becomes green most of the cars accelerate to cruising speed 50 km/h as soon as possible. With my car I need to reach between 2000 and 2500 RPM to accelerate at the same rate as the other cars on the road. In my openion

2000-2500 RPM is too heigh and that's why I think that my car has a poor torque at low RPM. So my question has always been like this: ok I think that my car has a poor torque, but compared to which car?

I never did a compression check so do you recommend me to let volvo dealer do the check or is it easy to do at home? I've found some info about on the net

but I'm notsure whether the instructionsare applicable to my car.

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I always use volvo filters.

I will keep this in mind.

Tim, on the 20v 5 cylinder engine, the oil filter screws onto the bottom of the engine, so the oil cannot drain out of it. (This is also very nice when one changes the oil and filter.)

I saw farther in your post you have the 10v and 20v engines. Is the oil filter placement different on these?

Anyway, I seem to remember something in my owner's manual about ticking noise from the hydraulic lifters. It says that it is acceptable for the first few minutes in a cold engine, provided the engine is not run faster than about about 3000rpm. Mine has never "ticked" for more than ten seconds, even after sitting for over a month.

And back to the original post, if anybody told me 15w40 oil damaged a 9 year old engine, I would be suspicious of anything else that mechanic had to say. That is exactly what weight of oil I would choose in my car if I were to run it hard on the autobahn.

All the 10 and 20v (petrol) engines up to around 2001 have the same style of filter- which hangs under the engine. Drain back is not much of a problem, but its the usual case with lifters that suddenly become noisy on cold start after an oil / filter change. I've never ever had noisy lifters on either engine- after an oil change or after several weeks of non-use and always use a genuine Volvo or Mann filter.

The 10v engine is alot more torquey than the 20v but I'd like to see any engine which will accelarate a car quickly at 2000rpm that isnt a turbo diesel! To the OP- rev it abit harder! The 10v cars are pretty high geared as it is....

I shall be sticking with the 15w-40 oil in my car too- it gets varied use, various medium speed driving but also some high speed work- 90-100mph cruising for upto 3 hrs at a time also, which is a steady 4000rpm or so.

Tim..

Your car is probably ok - its just that you're not adopting the same "boy racer" driving style as some of the other drivers in the traffic lights grand prix!

If you want to do a compression test, the instructions which you quote are perfectly ok. You should be able to buy a compression tester from a motor accessory shop fairly cheaply. In the uk, the are the equivalent of about 25 Euros. It's quite easy to do yourself if you follow the instructions.

The other things to check if you are worried about performance are that the fuel and ignition systems are correctly set up. You would probably need to pay a professional to do those.

Hmmm, my '96 US market Volvo 850 owners manual specifically *suggests*

15W-40 as the best oil to use for operating at temps above freezing.

Whatever is wrong with your Volvo, I don't think 15W-40 oil caused the problem unless you were using it during very cold winter conditions.

John

I've never driven the 10 valve version of the 850 motor, but I will say that

2000-2500 RPM is hardly pushing a 2.5 liter 5 cylinder engine.

John

Having had both the 20v 2 litre and now the 10v 2.5, I can say that neither will accelorate the car much at sub 2500rpm levels, infact i'd consider trying to accelarate rapidly at these engine speeds would be labouring the engine. Change down and let it rev abit higher- much better for the engine.

With the 10v there is good performance to be had from 2500rpm upwards, and it then dies at about 5000rpm.

With the 20v not alot happens below 3500rpm, and its still pulling hard at

6500rpm (which is into the red on the tacho)

The larger engine isnt actually any faster, just alot easier to drive quickly.

The auto suits the smaller engine better as its keen to kick down and let the engine rev, whereas the manual gearbox suits the larger 10v engine better.

Over the same driving course, you'll find the 2.5 10v engine more economical, especially in open road motoring. (the gearing is alot higher too)

Tim..

[dutch] Husam, waar zit je ergens in nederland? [end dutch]

Look out here! Volvo 850 is a very big and heavy car. You don't have the very powerfull turbo engine!

And then again, most idiots with smaller, lighter cars accellerate at higher RPM's. Why shouldn't they? They trow away their cars anayway after 200.000 Km. I agree that the 850 is a car that is very well suited with shifting arround 2500-3000 rpm. BUT, as i did this in my 740, in my dad's 850 i always tended to drive a bit more RPM. My V70 is equipped with an 2.0 liter engine (smallest on the market in this car) so might be a bit to small to accellerate fast with such a heavy car AND get the durability i am used to from Volvo.

If you live anywhere near maastricht, let me know. You can drive my V70 and see how it performs against your 850.

Also I would drive your car, if that's okay with you, and compare it to my dad's with the samen engine.

The part on the oil is bullshit by the way. Dealer over here in holland also replaces wit 15W40 or max 10W40. The tikking is normal (self-adjusting "klep-stoters" [dutch] are making the tikking sound. Sound also gets worse as car get's more miles on it. Tikking lasts longer and is louder when not enough oil in the engine. Read your manual. Tikking last up to 20 seconds. During that period you are not supposed to rev up your engine above, i think, 2000 or 3000 RPM.

Nice car by the way. Enjoy it. Will last for years.

If you live in Limburg, go to Biermans in Maastricht. Klijn in Heerlen sucks!! They took away his dealership twice! now is a brother or a nephew that started again with the volvo dealership. Service is still crappy. They don't know what they are talking about.

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