Castrol 5w30 Syn Blend in B&S?

[C4Dave]

I bought a new rear-engine rider about 10 years ago that has a 10 hp Briggs & Stratton air-cooled OHV engine. At the time I found a deal on Valvoline Synthetic 10w30 (recommended weight) and bought a case. Oil has been changed yearly since new, and the engine doesn't use any oil and the oil comes out clean.

The Valvoline Synthetic is now gone and I just got some 5w30 Castrol Syn Blend. Looking for opinions on the Castrol vs. the Valvoline. I know the Valvoline was an old spec and as such had higher amounts of ZDDP. Does the Castrol have other anti-wear agents in it that will protect as well as the Valvoline?

Current B&S recommendations are for 5w30 synthetic with no temperature limit, or 5w30 conventional with a 40*F max limit. Is the syn-blend, which is Dexos rated, close enough to a synthetic to use in the summer?

 

[charbaby]

Oh yeah, you'll be fine! I am assuming that the Valvoline Full Synthetic 10W30 that you just finished was SL GF-3 and of course the new Castrol SynBlend is SN GF-5.

That cam is broken in and all is well and newer oils have AW additives that will do just fine in your B&S.

 

[bubbatime]

Of course it will work, but it will consume more than the synthetic you were used to. I'd go pick up a jug of synthetic 10W30 myself.