I have been using conventional oil in my 2006 T4R and am thinking of changing to synthetic Mobil 1 5w30. I always changed my oil at 3000k or 3 months. What have owner's been doing with their synthetic oil change schedules ? would 6 months or 5k be good ? Are there any negatives if you swithc back and forth betweeen conventional and synthetic?

This is very much a debatable question. Many theories on each side. The interval you suggested would be plenty. You could likely go longer.

Try the google custom search above and put in: synthetic vs. dyno (or conventional). Will be many threads and tons of info with people asking the same question already.

Hopefully that helps.


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Mobil1 6 month changes for me.

Regular or Synthetic...I would still do 5,000 miles or 6 months, ...whatever comes first

Yeah, I re-thought my response after sending and agree on the 6 month/5k.

Its your motor and you want to do the best for it.

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I use M1 with a Puralator PureOne filter in my wife's Focus and my 4Runner and I change them by 8000 miles or 10 months whatever comes first. I think it's also dependant on how much time the oil is in your engine along with the miles so even if my 4Runner only saw 3000 miles in a year I'd still change it by 10-11 months.

AMSOIL, once a year or every 25K miles. Normally change all the Oil in the vehicles every April.

One year or 10K miles, which ever comes first.

Koz

Mobil 1 5w-30 SUV since new. Oil/filter change at 5k, filter only at 2.5k. At 98k, still runs like new.

Pennzoil Platinum Synthetic 5W-30

Six months or 7500 miles.

The V8 engine is very easy on oil!

For years I have used conventional oil and changed @ 3,000. I use Castrol GTX. When I got the 2001 4Runner, I decided to switch to Mobil 1 and settled on changing oil @ 5,000 miles. If found that if you think 3,000 miles for conventional is a bit of over kill, then 5,000 is a bit of over kill for synthetic. I then bought a used 2004 4Runner and I changed it over to synthetic. I find the oil looks better at 5,000 miles then conventional oil @ 3,000 miles.

I have read quite a few articles about going further with synthetic. I even wrote a thread about going further, but I thought it best to stick with the 5,000 miles. I change the oil myself and it cost me 26 dollars to change the oil with sythetic. I thought it is better for peace of mind to keep it @ 5,000.

I do have an older car with 160,000 miles and I did not change over to sythetic. I have heard different stories of changing over to synthetic oil over 100,000 miles. My 2004, I changed the day I bought it and it had 41,000 miles and I had no problems.

If it were me, I would consider changing over to sythetic oil in the 2006. If you change the oil @ 3,000 miles, I personally would not have a problem changing over, even if you have over 100,000 miles.

For me with all my cars-
Dino oil (what ever is on sale)- 5K miles or 6months
Synthetic (what ever is on sale) -8k miles or 10 months

Filters - Toyota OEM, PurOne or Bosch.

I use Synthetic in all my cars up to 125k miles then I switch to dino. I found the longer I used synthetic in a high mileage vehicle he more leaks and burn off I got. I switch to the cheaper dino on these cars and I got less leaks and less burn off.

I moved to Mobil 1 synthetic on all my vehicles back in 1994.

I put about 20,000 miles per year on my T4R. I change (as I did in my other DD's) every 10,000 miles. The oil that comes out looks new. Not dark at all.

I will admit that I change in my Corvette at the 5,000 mile interval, but that is less than once-a-year. The "oil service indicator" on the Vette usually shows about 60% remaining in the oil life. Mobil 1 is the recommended oil for the Corvette, and it is strongly advised to run the service indicator to 0% before changing. Even with this rhythm, the LS1 engine is designed to live well past the 200,000 mile mark. Corvette Forum is full of "high mileage" rides still being enjoyed (read flogged) each day.

BOTTOM LINE: depending on your driving habits, towing, "stop and go" driving, you should be able to approximately double the mileage interval with synthetic oil.

JMHO

I've been using Mobil 1 for about two years now but I use 0w-30 synthetic just for the better winter starts (and it's the same price as 5w-30 at Walmart so I figured 'what the heck?'). I change every 6500 miles / 4 months give or take and I use Mobil 1's double capacity oil filter.

The OCI really varies depending on where you live. If you're up north where it gets cold and there isn't much in the way of dust/microscopic debris flying around, you can go longer but if you live in a place like Arizona where you've got sand almost everywhere then you'll want to cut it down so you can flush the crap out of your engine sooner.

PerfectAgent007 where are you in AZ. We are in Tempe. Change my oil every 5000 with a synthetic blend. Mike's Tire will change the oil, filter, lube the driveshaft, rotate and balance tires, and check over the car for $55. I figure with the extremes here in AZ 5000 miles is appropriate.