T
tomm
Can engine oil which is thicker than recommended cause engine "rattle" or
"knocking" ?
"knocking" ?
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M
malc
tomm said:Can engine oil which is thicker than recommended cause engine
"rattle" or "knocking" ?
I would have thought it would have to be very much thicker than normal.
Depends on the engine though as to what it can tolerate. A bog standard
Vectra 1.8 can take almost anything dependant on the climate.
Oil's cheap. If you think it's the problem drain it and start again.
--
Malc
Rusted and ropy.
Dog-eared old copy.
Vintage and classic,
or just plain Jurassic:
all words to describe me.
T
tomm
malc said:I would have thought it would have to be very much thicker than normal.
Depends on the engine though as to what it can tolerate. A bog standard
Vectra 1.8 can take almost anything dependant on the climate.
Oil's cheap. If you think it's the problem drain it and start again.
Well I got a mate to service my astra. He put 10w40 in . I dont know what
was in before. now the engine is noisier.
Most oil checkers online recommend 5w30 with a few saying 5w40.
M
malc
tomm said:Well I got a mate to service my astra. He put 10w40 in . I dont know
what was in before. now the engine is noisier.
Most oil checkers online recommend 5w30 with a few saying 5w40.
What does your manual say? It's a possibility that the thicker oil is a
problem. I wouldn't drive it too far until you're absolutely sure.
--
Malc
Rusted and ropy.
Dog-eared old copy.
Vintage and classic,
or just plain Jurassic:
all words to describe me.
T
tomm
thanks for replying...malc said:What does your manual say? It's a possibility that the thicker oil is a
problem. I wouldn't drive it too far until you're absolutely sure.
--
the handbook says..
We recommend using vauxhall engine oils with the following qualities and
viscosities
ACEA A3/B3 SAE 0w-30
or
ACEA A3/B3 SAE 5W-40
or
ACEA A3/B3 SAE 10w-40
For commercially available oils..only the following viscosity classes are
permitted
SAE 10W-30 (or higher than 30)
or
SAE 5W-30 (or higher than 30)
or
SAE 0W-30 (or higher than 30)
M
malc
tomm said:thanks for replying...
the handbook says..
We recommend using vauxhall engine oils with the following qualities
and viscosities
ACEA A3/B3 SAE 0w-30
or
ACEA A3/B3 SAE 5W-40
or
ACEA A3/B3 SAE 10w-40
For commercially available oils..only the following viscosity classes
are permitted
SAE 10W-30 (or higher than 30)
or
SAE 5W-30 (or higher than 30)
or
SAE 0W-30 (or higher than 30)
This is getting beyond my knowledge of oils and engines. Personally I
wouldn't have said it's too far wrong but....
--
Malc
Rusted and ropy.
Dog-eared old copy.
Vintage and classic,
or just plain Jurassic:
all words to describe me.
B
Brim
Depends how old your Astra is. Up until about 2003/4 standard oil for
Vauxhalls was 10W/40 semi synthetic. With the push towards 20,000 mile
service intervals or even worse Flex Servicing, Vauxhall moved towards
5W/30 fully synthetic at about twice the price.
http://www.carbibles.com/engineoil_bible.html is also worth a read.
Vauxhalls was 10W/40 semi synthetic. With the push towards 20,000 mile
service intervals or even worse Flex Servicing, Vauxhall moved towards
5W/30 fully synthetic at about twice the price.
http://www.carbibles.com/engineoil_bible.html is also worth a read.
B
brian whatcott
Modern engines can use smaller oil passages with the thinner oils nowtomm said:Can engine oil which is thicker than recommended cause engine "rattle" or
"knocking" ?
specified. But 10-30 even 20-50 is not so much thicker as to cause your
rattles. Oil viscosity varies TREMENDOUSLY with temperature - synthetics
less so.
If you noticed a rattle after an oil change - especially if the new oil
is synthetic which has better hot film strength - its prabably
coincidental - unless your friend ran the engine dry until he realised
he hadn't put the new oil in yet....
Brian W