5W-30 instead of 10W-30

[SubieRubyRoo]

No. A 5w-30 is a 5 grade oil. Let that percolate. It has viscosity improvers to make it act, as a 30, when hot. It's like peanut butter and roofing nails compared to SAE 30w. SAE 30w has a much higher film strength.

Read your mower engine manual on oil. If it says run olive oil then that's what you use.

Then there's the old saying any oil is better than no oil.

Maybe you should read just about any manual on oil, bud. A 5w30 is not a 5 grade oil. It’s a 30 grade oil that passes cold flow tests deemed “5w” which means it has to pass specific CCS and MRV testing at -35*C.

https://grok.com/share/bGVnYWN5_5194916d-5cdc-412f-8bf3-e21905ae2fc5

 

[slomo]

Maybe you should read just about any manual on oil, bud. A 5w30 is not a 5 grade oil. It’s a 30 grade oil that passes cold flow tests deemed “5w” which means it has to pass specific CCS and MRV testing at -35*C.

https://grok.com/share/bGVnYWN5_5194916d-5cdc-412f-8bf3-e21905ae2fc5

Keep reading bud. Already knew what your link stated.

 

[slomo]

No. A 5w-30 is a 5 grade oil. Let that percolate. It has viscosity improvers to make it act, as a 30, when hot. It's like peanut butter and roofing nails compared to SAE 30w. SAE 30w has a much higher film strength.

Read your mower engine manual on oil. If it says run olive oil then that's what you use.

Then there's the old saying any oil is better than no oil.

This is from google. Be mad all you want.

 

[Lockasiam]

This is from google. Be mad all you want.

View attachment 279405

how can you have been on here since 2013 and not know that a 30 grade oil is 30 grade regardless of the W rating

 

[slomo]

how can you have been on here since 2013 and not know that a 30 grade oil is 30 grade regardless of the W rating

I agree with what you just typed above this sentence.

We were talking about 5w-30. THAT is a 5 grade thin oil with viscosity index improvers by the car load to make it a 30 at 212F or 100C. That is all fella.

 

[slomo]

Lets write it all out. Some are confused on here.

1. 5w-30 is a multi-grade oil. We all agree?
2. "Typically made" with a base oil and additives. Still with us? To modify it's properties, (pause) "specifically it's viscosity" at certain temps.

Don't shoot the messenger.

 

[RDY4WAR]

When it comes to common API oils, the 5W-30 version of a particular oil series is almost always superior to the 10W-30 version. The same applies to 5W-40 vs 15W-40 and 5W-50 vs 20W-50. The narrower multi-grades can be made with cheaper, lower quality base oils and still meet the spec. The major brands exploit this to increase profit margins. You're getting less for the same money. A 5W-30 or 5W-40 forces them to use better quality base oils and VII to meet the wider spread.

This does not apply to certain boutique brands that formulate to a performance point instead of a price point such as HPL, Amsoil, Driven, and Red Line. You're going to get top shelf quality from them no matter the grade.

 

[kschachn]

I agree with what you just typed above this sentence.

We were talking about 5w-30. THAT is a 5 grade thin oil with viscosity index improvers by the car load to make it a 30 at 212F or 100C. That is all fella.

That is nonsensical.

 

[Elkins45]

Lets write it all out. Some are confused on here.

1. 5w-30 is a multi-grade oil. We all agree?
2. "Typically made" with a base oil and additives. Still with us? To modify it's properties, (pause) "specifically it's viscosity" at certain temps.

Don't shoot the messenger.

I don’t think you understand as well as you believe you do.

 

[SubieRubyRoo]

This is from google. Be mad all you want.

View attachment 279405

That doesn’t say what you think it does, regardless of the source.

 

[Lawnman23]

what about a 15w40 HDEO?

Would be great. I use it in all my summer OPE.

 

[Lockasiam]

Would be great. I use it in all my summer OPE.

Just dumped some ST Full Syn 15w40 in a 17.5hp single cylinder B&S and the rod knock is slightly quieter. Old oil had loads of glitter for an hour and a half in the sump. May need an engine change before the oil is used up unfortunately

 

[Lawnman23]

Just dumped some ST Full Syn 15w40 in a 17.5hp single cylinder B&S and the rod knock is slightly quieter. Old oil had loads of glitter for an hour and a half in the sump. May need an engine change before the oil is used up unfortunately

I have a jug of the full-synthetic SuperTech 15w-40 on deck once I finish my T5 supply. VOA on it appeared to be quite good for the price point.

Yeah, heavier oil will help dampen the knock to a point but will need a rebuild if you intend to keep it long term.

 

[Lawnfella]

I run Rotella t6 5w-40 in all my small engines

 

[RDY4WAR]

I run Rotella t6 5w-40 in all my small engines

Geez. If you hate your engines, just say so. No need to drag out the volatile R word.

 

[The Critic]

I agree with what you just typed above this sentence.

We were talking about 5w-30. THAT is a 5 grade thin oil with viscosity index improvers by the car load to make it a 30 at 212F or 100C. That is all fella.

Based on your statement, an oil will thicken when hot. This is simply not true.

 

[Lockasiam]

I have a jug of the full-synthetic SuperTech 15w-40 on deck once I finish my T5 supply. VOA on it appeared to be quite good for the price point.

Yeah, heavier oil will help dampen the knock to a point but will need a rebuild if you intend to keep it long term.

If it blows it blows, lining up a replacement engine isn’t that difficult

 

[53' Stude]

I run 5W-40 in all my small engines. Its just what I do.
i also use 5-30 in my Mazda 6 that calls for 0w-20. Just what I do.

Smart man.

 

[kschachn]

Geez. If you hate your engines, just say so. No need to drag out the volatile R word.

So are you saying Rotella T6 5W-40 will cause a guaranteed failure?

 

[RDY4WAR]

So are you saying Rotella T6 5W-40 will cause a guaranteed failure?

No. I am saying the risk is higher though. An oil that produces >50 ml of foam isn't something I would trust in an engine that's WOT most of the time, especially with splash lubrication.