simba1

Member

• Apr 19, 2020

• #1

Hi will a 5w 30 semi synthetic oil be ok for a oil change ,as i have normally used mineral oil and have acquired some synthetic oil cheap GM dexos 1 5w 30 could it do any harm?
John.

 

Turboman

Mab An Gov

• Apr 19, 2020

• #2

simba1 said:

Hi will a 5w 30 semi synthetic oil be ok for a oil change ,as i have normally used mineral oil and have acquired some synthetic oil cheap GM dexos 1 5w 30 could it do any harm?
John.

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Quite likely it will do damage.
That sort of engine is designed for mineral oil.
Synthetic oil can cause the bores to glaze, gases to leak past the pistons, eventual damage to the pistons.
And is also too thin for the lubrication system of that engine.

 

R

Rodeo Joe

Well-Known Member

• Apr 19, 2020

• #3

I use 15/40 or 20/50 (or a mixture of them both depending how smokey things are getting).
Definitely has to be mineral oil.

 

R

Rodeo Joe

Well-Known Member

• Apr 19, 2020

• #4

Oh and there is a saying that any oil is better than no oil (but possibly not for long!)

 

simba1

Member

• Apr 19, 2020

• #5

Ok thanks guys will stick to mineral.

 

Huddy84

Well-Known Member

• Apr 20, 2020

• #6

Plus it’ll leak out much faster...

 

Henry_b

Think outside, no box required.

• Apr 20, 2020

• #7

You'd be better off filling the sump with used cooking oil.

Keep to mineral

 

samc88

Drivels spiritual representative

• Apr 20, 2020

• #8

5/30 is too thin,15/40 is preferable or 15/20 if the engines worn

 

kermit_rr

Very

Full Member

• Apr 20, 2020

• #9

samc88 said:

5/30 is too thin,15/40 is preferable or 15/20 if the engines worn

Click to expand...

Think you mean 20/50

 

samc88

Drivels spiritual representative

• Apr 30, 2020

• #10

kermit_rr said:

Think you mean 20/50

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Yes that one, thanks didn't spot that one