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For the most part you are right Hugh. In fact even 5000 miles or 6 mos will work for many.

However, if you are driving hard, or on the track, you want an oil that has a higher breakdown threshold. Mobil 1 offers such an option albeit not the only one. Just like brake fluids, a generic DOT 4 would suffice but many opt for ATE, Motul or even Castrol SRF to make sure they don't boil them.

Edit: Independent testing may or may not confirm this, but here is one measure. The flash points for 10-30W based on manufacturer's websites are:

Mobil 1: 435F
Asmoil: 475F
Royal Purple >400F
Red Line: 480F
Valvoline Synpower: 482F
Castrol Syntec - they don't provide flash point
Penzoil Platinum Synthetic: 385F
Q Advanced Full Synthetic: 437F

Now I know why Shad stocks Valvoline and RedLine ;-)

<blockquote data-quote="Hrant" data-source="post: 676353" data-attributes="member: 4839">For the most part you are right Hugh. In fact even 5000 miles or 6 mos will work for many.However, if you are driving hard, or on the track, you want an oil that has a higher breakdown threshold. Mobil 1 offers such an option albeit not the only one. Just like brake fluids, a generic DOT 4 would suffice but many opt for ATE, Motul or even Castrol SRF to make sure they don&#039;t boil them.Edit: Independent testing may or may not confirm this, but here is one measure. The flash points for 10-30W based on manufacturer&#039;s websites are:Mobil 1: 435FAsmoil: 475FRoyal Purple &gt;400FRed Line: 480FValvoline Synpower: 482FCastrol Syntec - they don&#039;t provide flash pointPenzoil Platinum Synthetic: 385FQ Advanced Full Synthetic: 437FNow I know why Shad stocks Valvoline and RedLine ;-)</blockquote>

[QUOTE="Hrant, post: 676353, member: 4839"] For the most part you are right Hugh. In fact even 5000 miles or 6 mos will work for many. However, if you are driving hard, or on the track, you want an oil that has a higher breakdown threshold. Mobil 1 offers such an option albeit not the only one. Just like brake fluids, a generic DOT 4 would suffice but many opt for ATE, Motul or even Castrol SRF to make sure they don't boil them. Edit: Independent testing may or may not confirm this, but here is one measure. The flash points for 10-30W based on manufacturer's websites are: Mobil 1: 435F Asmoil: 475F Royal Purple >400F Red Line: 480F Valvoline Synpower: 482F Castrol Syntec - they don't provide flash point Penzoil Platinum Synthetic: 385F Q Advanced Full Synthetic: 437F Now I know why Shad stocks Valvoline and RedLine ;-) [/QUOTE]

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