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Been using 5w 20 semi synthetic every oil change and filter 3500 miles

I am going to make a change to FULL synthetic is there any problem doing so after using synthetic mix or for that matter regular oil? I will keep same viscosity.

Second question: If changing to full synthetic (got great price on it) can I go 7500 miles? If so do i still change filter every 3500 miles.
 

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Been using 5w 20 semi synthetic every oil change and filter 3500 miles

I am going to make a change to FULL synthetic is there any problem doing so after using synthetic mix or for that matter regular oil? I will keep same viscosity.

Second question: If changing to full synthetic (got great price on it) can I go 7500 miles? If so do i still change filter every 3500 miles.
I use synthetic in all my vehicles. My Vette calls for Mobil 1 or any oil meeting GM spec 4718M This spec is for very extreme use at high temperatures. I don't change the oil till about 7500 miles and always use a new filter. Use it in 2 Taurus's a Mustang and a Montana also Don't see any problem using synthetic.
 
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