This is for a lawnmower with a 190cc B&S engine (6.75). The manual says just to use any heavy duty SAE30 oil and dump every year. I was initially thinking of using GC, but then figured it'd be like throwing diamonds at a swine, and figured I'd get something less glamorous. I would have gotten Rotella T 30-weight, but it was only available in 1 gal jugs - that'd take me 5 years to finish, if not more. So I picked up a quart of yellow Pennzoil HD30 for now. Is this oil OK or is there something more appropriate for my needs? Thanks!