I have a 97 SH with a 147000 miles on it and I was wondering if it was ok to switch over from a synthetic oil to a high mileage oil?

If so, which brand would you guys recommend? Castrol? Pennzoil?

I just want to make an extra precautionary meaure as my engine is reaching some old age.

Thanks guys

 

you might wanna go with a syn blend first for a few oil changes then move onto a full syn.

I use Mobil 1 Syn 5w-30

 

He said he already ran synthetic.....not that he wants to start.

 

Yeah i currently run Mobil 1 Full Synthetic.

My concern was the switching over from Full synthetic to a High mileage oil.

Would it hurt the engine or will the transition damage parts?

Thanks!

 

OH! sorry

 

It will be fine! Most High-milage oils are a synthetic blend, which will be fine to put into your engine during the next oil change.

 

If you're already running synthetic, why switch? I think high mileage oils are a scam.

 

Thats a good point, but I just want to know if anybody has experienced anything positive from this transition.

Good or bad? same ?

Ive been running mobil 1 syn since I bought my car back in 97 and my car has been flawless with regards to any engine problems. I just want to make sure I am using the right oil for such a high mileage car.

Thanks again

 

If you are not having any problems using synthetic, you should stick with it. High mileage oils are of lower quality than synthetic (because of their synthetic/dyno blend). You'll effectively be downgrading for what appears to be no reason other than a label or commercial. Stick with the synthetic.

 

Sounds good enough to me.

Why would I change something that hasnt given me problems.

Thanks guys!

 

so your saying that if you dont already use synthetic you should use a blend for a couple of changes then use full synthetic. What could happen if you just switch to full synthetic?
I have alot of miles on my car and i was just wondering. thanks.

 

I don't think you are going to gain much from High mileage oil honestly. Since you already have ran synthetic for so long, keep it. Synthetic in general is a lot better than conventional or blends.

 

Its easy.......high milage oils are not a "Scam",they are formulated for different reasons than a synthetic.Usually the biggest bennefit from high milage oil is that they help condition/recondition older rubber/plastic seals in the engine.They also usually have a higher detergent level to help clean carbon,and other"sludge' from the engine.

With that said, a quality full synthetic like mobile 1, redline,royal purple,even torco,is a much better peformance oil,and even all around oil,but synthetics are very very slippery in contrast to conventional and high milage oils,so they are not always the best option for a car with 150k on the odometer.Your car is obiously an exception,and would tell you that as long as you have no problems with running full synthetic,stick with it.Mobile 1 is a great oil,and if u have no oil burning problems,or leaks stick with it for as long as you can.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SNYPA &raquo;</TD></TR><TR><TD CLASS="quote">so your saying that if you dont already use synthetic you should use a blend for a couple of changes then use full synthetic. What could happen if you just switch to full synthetic?
I have alot of miles on my car and i was just wondering. thanks.</TD></TR></TABLE>

That's not entirely accurate. As long as you stay within the same brand, you can switch from conventional to synthetic, or even mix the two. The key to it all is the additive package. That's why it's bad to mix different brands. If you're already running a certain brand, see if that brand makes a synthetic oil. If they do, simply switch to that your next oil change. However, on an older motor, switching to synthetic, reguardless of brand, can cause some unexpected leaks

 

10w-30 Syn. is what i've been using since it hit 100k

 

185k miles on it and been using 10-30 syn since like 100k. still running strong

 

10w30 mobil1 here at 126k

210comp accross

 

I'm using Royal Purple 10w40 for summer, 10w30 for winter. I wouldn't dare use mineral oil in dohc vtec engine (for my work commuting/weekend racing).