2007 GMC Sierra Oil Switch Question

[rangerhgm]

I've got a 2007 GMC Sierra SLE 5.3 4x4 with 55K miles on it.

 

I've been running Quaker State 10w-30 oil and AC Delco PF48 filter and am trying to decide whether to switch to full synthetic oil or not on my next oil change.

 

Has anyone who made the switch noticed any mileage, or performance, difference?

 

I was thinking Mobile 1 fully synthetic and staying with the PF48

 

Any recommendations on brand of oil/filter?

[thisbudsforyou]

I switched to royal purple 5w30 after 30k miles. The engine runs smoother and cooler. I like not having to change the oil for 15k miles (5k on first oil change after switching b/c RP has a cleaner that breaks down carbon left by conventional oil) I highly recommend looking at the site and watching some of the tests they do. I have it in all cars, lawnmower, 4-wheeler and boat. I had a buddy switch to mobil 1 and it gummed up and ruined his engine. I also use RP filters.

[jdubub]

RP is good but I have always used Amsoil.

 

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[Sir Dan]

+1 on the Amsoil. Its good stuff but really any full synthetic is head and shoulders above your quaker state! I do use a Mobil 1 filter though just because they are easy to find around here.

[Wires]

I've used Mobil 1 in all my vehicles. Last oil change it was Castrol Edge Synthetic since it was on sale at Costco.

 

I highly doubt Mobil 1 gummed up and destroyed his engine though. Pure BS......

[jdelrizzle]

Why not just stick to the Quaker state except go with the full synthetic ultimate durability it's good stuff, so is Mobil 1.

[Mulaka]

I've got a 2007 GMC Sierra SLE 5.3 4x4 with 55K miles on it.

 

I've been running Quaker State 10w-30 oil and AC Delco PF48 filter and am trying to decide whether to switch to full synthetic oil or not on my next oil change.

 

Has anyone who made the switch noticed any mileage, or performance, difference?

 

I was thinking Mobile 1 fully synthetic and staying with the PF48

 

Any recommendations on brand of oil/filter?

 

 

Why not just stay with Quaker State? Their full synthetic (Ultimate Durability) is an outstanding synthetic oil and can be had at Walmart for $20.00 for a five quart jug.

[Mossyoakglock]

Is there any harm switching brands of synthetic oil? I've ran Mobil1 for about 50,000 miles but they always have Quaker State or Castrol on sale. Is there any harm in going back and forth between brands, but staying with synthetic?

[rotti]

None at all.

[hodo78]

I switched my dad's 2002 Ford Explorer over to 10w30 Mobile 1 high mileage (full synthetic) at 90k miles when he bought it 3rd hand. At which point the owner just had been running whatever was the cheapest at walmart when he needed a change.

 

He has had it now for 3.5 year and put 20k miles on it with no issues what so ever.

 

In fact, his the explorer is been averaging 21.5 MPG HWY (hand calculated) ever since its first road trip he took it on shortly after we bought it, changed the oil, fuel & air filters, and did a full tune up.

 

Funny thing is, we still have the original window sticker that shows mileage at 15 cty 20 hwy.