Yes, SAE 30 and 10W-30 can be mixed, as they are both petroleum-based oils and compatible with each other. SAE 30 is a single-grade oil, while 10W-30 is a multi-grade oil that provides better performance in varying temperatures. However, mixing them may alter the viscosity characteristics of the oil, potentially affecting engine performance. It's generally best to stick with one type for optimal results.
No, absolutely not.
If it is a Briggs engine it takes SAE30. If it is a Kohler engine it takes 10W-30.
The user's guide to my 130 series B&S engine (garden cultivator) says: 10W-40 can be used if 10W-30 is not available at your location. So, if you fit to the 10W-30 oil temperature interval then 10W-40 probably can be used. I have been using SAE30 up to now. Now I am planning to switch to 10W-40 as I want to use the machine in the winter as well.
The user's guide to my 130 series B&S engine (garden cultivator) says: 10W-40 can be used if 10W-30 is not available at your location. So, if you fit to the 10W-30 oil temperature interval then 10W-40 can be used. On the other hand lawnmower is usually used at spring-summer temperatures so why not to use SAE30 oil?
If the manufacturer of the lawnmower specifies only SAE 30 then do not use SAE 10W-30. However on most mowers you can use either weight. I highly recommend you use synthetic oil in any air cooled engine.
Yes
The 50W is not a multiviscosity.
nothing
Pennzoil 10W-30 or 10W-40.
10W-30 or 10W-40 can be used.
10w-30 or 10w-40 oil
SAE30 is used in most Briggs and Stratton engines.