Engine 850: B5252S/2.4/10v: What oil?

i dont agree with amsoil here, his gloomy prediction that your engine will have "significant wear" (because i assume its age) is imho boloxs, sorry, i will amend that, unduly pessimistic shall we say, ive worked on numerous examples of these engines and have never found any significant wear in any of them, even after considerable mileage, its amazing how durable they are, my own t5 still had the honing marks on the bores after nearly 200k miles and found no wear whatsoever to the crank, cams, etc, the big end shells were showing slight wear but that was very slight, so i would use whatever the manual says, im sure a good quality 5 -40 or 10 -40 mineral oil will be just fine, you can of course go down the synthetic route if you wish but in your case the benifits i think would be marginal if any apart from the longer service interval

[amsoil]

Dear Chow we meet again! Do read my post properly before jumping in with 2 feet. You even finally recommend the same as me but are rude without reasoned arguments.
A small amount of wear at the bearings will make a significant difference to the quantity of oil that passes, please do the maths. What I recommended and you agree with is nothing more than what the manufacturer recommends. I would not however recommend the thinner alternative, a 30 grade, especially in a mineral form as the thinner oil will flow faster through a larger clearance which could lead to a pressure drop and ultimately a bearing failure as a result. If you have a reasoned argument then please post it as I and no doubt most of the forum members are always ready to learn something new.

Originally Posted by amsoil

Dear Chow we meet again! Do read my post properly before jumping in with 2 feet. You even finally recommend the same as me but are rude without reasoned arguments.
A small amount of wear at the bearings will make a significant difference to the quantity of oil that passes, please do the maths. What I recommended and you agree with is nothing more than what the manufacturer recommends. I would not however recommend the thinner alternative, a 30 grade, especially in a mineral form as the thinner oil will flow faster through a larger clearance which could lead to a pressure drop and ultimately a bearing failure as a result. If you have a reasoned argument then please post it as I and no doubt most of the forum members are always ready to learn something new.

sorry, you claimed that his engine would have "significant wear" your words not mine which if you knew anything about these engines you would know is a rather stupid assumption to make, and if you really think that a couple of tenths of a thou wear on a main or big end shell is going to lead to engine failure due to low oil presure your talking even more garbage im afaid, for an engine to lose that amount of oil pressure due to bearing wear would mean the bearing was totally knackered and would be knocking its head of, you know and i know that given that this engine is more than likely in good order the oil recomeded by volvo will be more than adequate and there is no need whatsoever to use anything else

[amsoil]

Originally Posted by chow

sorry, you claimed that his engine would have "significant wear" your words not mine which if you knew anything about these engines you would know is a rather stupid assumption to make, and if you really think that a couple of tenths of a thou wear on a main or big end shell is going to lead to engine failure due to low oil presure your talking even more garbage im afaid, for an engine to lose that amount of oil pressure due to bearing wear would mean the bearing was totally knackered and would be knocking its head of, you know and i know that given that this engine is more than likely in good order the oil recomeded by volvo will be more than adequate and there is no need whatsoever to use anything else

My dear Chow, As an oil importer and retailer to the trade and private individuals for land sea and air, I will still admit that there can be gaps in my knowledge particularly as I don't believe that anyone can know it all. I do however also build engines albeit mainly for racing and even Le mans and as such have , I think, grasped the concept of oil circulation together with its cooling and lubricating qualities. I don't however claim to know it all.
Having put forward, I believe, a reasoned explanation of why the thicker 40 grade option of oil should be used over the 30 grade I thought that most people could have understood and appreciated what I was getting at.
There has never been any suggestion that Phil45 has a knackered engine (your words) but it is reasonable to assume that it has run on mineral oil and done more than 4k or so between services. It is also reasonable to assume that not only have you not done the calculations but that as good as Volvos are they use the bearings generally available and clearances generally used given the bearing selection and the oil that can be expected to be used. Reasonable wear is acceptable and to be expected and at 140K it is reasonable to expect that what wear there is would steer someone towards a 40grade rather than the 30.
I would expect you to respond but wont expect any reasoned arguments about whatever you are going on about. Without such reasoned arguments I see no reason to reply to what I fear will be impolite and unreasoned. Enough said

[CTCNetwork]

Hi,

Originally Posted by amsoil

I would expect you to respond but wont expect any reasoned arguments about whatever you are going on about. Without such reasoned arguments I see no reason to reply to what I fear will be impolite and unreasoned. Enough said

I wouldn't go holding your breath waiting for a reasoned and polite reply from chow.
They are few and far between... Unfortunately...

Des. . .

[Jod T5]

Originally Posted by Phil45

Please has anyone got any recomendations on which engine oil I should use for my 850 glt 2.5 engine?

the owners manual seems to point to SAE 5W/40

Make and grade if possible please

Many Thanks

Phil

imo a mineral multigrade 10/40 would be fine for use in this country...and on your motor..
i would only consider semi or fully synth on a turbo charged engine ....which i have.....
cheers
jod

stop waffling amsoil, whats all this about "reasoned argument" for a 40 oil????? no one apart from you ever mentioned using a 30 oil! everyone (including myself advised a 40 weight oil) you brought a 30 oil up in your daft attempt to justify your comments about "significant wear" having occured(which suddenly became reasoable wear after i raised the point!) due to his engine having we presume covered a fair few miles, which if he used a 30 oil (which he never mentioned nor did anyone else!) then bearing failure could occur due to low oil pressure, what complete nonsense, for a engine to suffer serious oil pressure loss due to worn mains /big ends would only happen if the shells/journals were very badly worn in which case that knocking from the crank area might give it away, considering that your a "racing engine builder" you seem to have a sketchy knowledge of these issues, sorry mate your on here for one reason only to push your synthetic oil business

[Pete_L]

Going off subject just slightly, with apologies for breaking into the ongoing argument, I bought the car after it had been serviced so have no idea what oil they used. Would it matter if I topped up with mineral 10/40 whether or not the car contained semi or synthetic oil? In other words, does it do any harm to mix?

Cheers all

Pete

Originally Posted by Pete_L

Going off subject just slightly, with apologies for breaking into the ongoing argument, I bought the car after it had been serviced so have no idea what oil they used. Would it matter if I topped up with mineral 10/40 whether or not the car contained semi or synthetic oil? In other words, does it do any harm to mix?

Cheers all

Pete

hi, yes synthetic and mineral oils are compatable

[Jod T5]

Originally Posted by chow

hi, yes synthetic and mineral oils are compatable

sure but you would not think so to here some of the tattle on here...
cheers
jod