Isuzu 33 hp - Engine type 1m4lb33 - Which oil?

[Sofia]

Hello,

 

I have been trying to find online before asking on here.

 

Our engine needs an oil change but I am not sure which oil I need to purchase for our Isuzu 33 hp - Engine type 1m4lb33 ?

 

Would anyone who has this engine or knows what the correct oil is please?

 

Thank you in advance

[OldGoat]

Before everyone else jumps in, I'd suggest 15w/40 it's a mineral oil with plenty of body - ideal for commercial duty engines

 

Folks on here suggest 10w/40 which (IMHO) is too thin and may not lubricate too well in an old engine. Someone at Beta  Marine nearly exploded when I suggested 10/40 (I had loads of it). But times change.... The basis is that 10 grade oil is semi-synthetic and is too slippery, that encourages glazed bores = smokey exhaust (you don't want that)

 

Comments will doubtless follow - and I'd be interested to see their arguments...

[Sofia]

3 minutes ago, OldGoat said:

Before everyone else jumps in, I'd suggest 15w/40 it's a mineral oil with plenty of body - ideal for commercial duty engines

 

Folks on here suggest 10w/40 which (IMHO) is too thin and may not lubricate too well in an old engine. Someone at Beta  Marine nearly exploded when I suggested 10/40 (I had loads of it). But times change.... The basis is that 10 grade oil is semi-synthetic and is too slippery, that encourages glazed bores = smokey exhaust (you don't want that)

 

Comments will doubtless follow - and I'd be interested to see their arguments...

Thank you

[cuthound]

47 minutes ago, OldGoat said:

Before everyone else jumps in, I'd suggest 15w/40 it's a mineral oil with plenty of body - ideal for commercial duty engines

 

Folks on here suggest 10w/40 which (IMHO) is too thin and may not lubricate too well in an old engine. Someone at Beta  Marine nearly exploded when I suggested 10/40 (I had loads of it). But times change.... The basis is that 10 grade oil is semi-synthetic and is too slippery, that encourages glazed bores = smokey exhaust (you don't want that)

 

Comments will doubtless follow - and I'd be interested to see their arguments...

 

Surely the only difference between 10w/40 and 15w/40 is that the 10w/40 will be a bit thinner at very low temperatures, making starting easier. At higher temperatures (engine running at normal temperature) both grades will have the same viscosity.

[bizzard]

I didn't know there were canals in Bulgaria.

Edited November 4, 2019 by bizzard

[Boater Sam]

53 minutes ago, OldGoat said:

Before everyone else jumps in, I'd suggest 15w/40 it's a mineral oil with plenty of body - ideal for commercial duty engines

 

Folks on here suggest 10w/40 which (IMHO) is too thin and may not lubricate too well in an old engine. Someone at Beta  Marine nearly exploded when I suggested 10/40 (I had loads of it). But times change.... The basis is that 10 grade oil is semi-synthetic and is too slippery, that encourages glazed bores = smokey exhaust (you don't want that)

 

Comments will doubtless follow - and I'd be interested to see their arguments...

No argument from here. Straight cheap mineral oil, 15w/40. Runs all the tractors just fine and the Merlo forend loader which has the same engine as the most popular boat engines.

[Chewbacka]

According to mr google and assuming it is an Isuzu base engine type 4LB1, it is api spec CC or CD typically 15w40 depending on temperature.

Here is a link for an engine manual from a us generator supplier.  I don’t guarantee it is free from virus etc, but the pdf opened ok and without warning on my iPad.  
 

https://www.wincogen.com/wp-content/uploads/PD/Engines/ISUZU-4LE1-OPM.pdf

Edited November 4, 2019 by Chewbacka

[mrsmelly]

15/40 end of.

[Sofia]

46 minutes ago, Chewbacka said:

According to mr google and assuming it is an Isuzu base engine type 4LB1, it is api spec CC or CD typically 15w40 depending on temperature.

Here is a link for an engine manual from a us generator supplier.  I don’t guarantee it is free from virus etc, but the pdf opened ok and without warning on my iPad.  
 

https://www.wincogen.com/wp-content/uploads/PD/Engines/ISUZU-4LE1-OPM.pdf

Thank you

9 minutes ago, mrsmelly said:

15/40 end of.

Thank you

[Tony Brooks]

2 hours ago, mrsmelly said:

15/40 end of.

But that is only the viscosity. I would not want 15W40 synthetic oil in such an engine so the API CC, CD  is important. I would be happy with API CF or CH at  a push but not a higher spec.