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Old February 05, 2019, 15:14   #1
JAVIER
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question about synthetic oil on a 1999 honda crv

Hello: I have a 1999 honda crv and just rolled to 104.000 miles. my wife had a 2004 volkswagen beetle that used 5w-30 full synthetic. she sold the car, and now I have 7 cases left of Valvoline full synthetic 5-w30 . my Honda CRV uses 5w30 and I have been using Valvoline semi-synthetic 5w-30 since I bought it with 83.000 miles back in 2008. I read on the internet and oil forums, that switching from regular oil to full synthetic it will cause more harm than good. others, say: it does not pose a problem. others say: is a waste of money, others say: that the full synthetic will removed all the inside the engine carbon deposits that the regular oil does not remove and then it will start leaking real bad. my honda as I speak right now, does not leak with the semi-synthetic oil. what do you think? since in my case, I would like to switch from semi- synthetic to full- synthetic to use all that oil that I already have. Do you think is ok for me to use that 5w-30 full synthetic on my CRV with OUT any worries or should I stay with the semi-synthetic ? and try and sell the full synthetic to some one that uses full synthetic?
thank you.
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Old February 05, 2019, 15:52   #2
nwobhm
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I have been using full synthetic oil for almost 20 years. Most of the time I run it 7,000+ miles between changes. I have gone upwards of 10,000 without issue. I only use Mobil 1.
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Old February 05, 2019, 16:05   #3
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I have been switching over to full synthetic in everything I have owned since the early 90’s had a few that leaked the same after the switch as before but none that ever started a leak when I switched or shortly there after. A good share of them had over 100k before I switched, one was an 85’ k5 blazer (m1009) it got switched when I bought it 4 years ago with 50k on the clock and still no leaks
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Old February 05, 2019, 16:33   #4
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I have my old cars which get Dino oil and an additive for flat tappet cams but recently have bought some newer vehicles for the wife, son and myself. All under 50K miles so stocked up on syn oil. Royal Purple 5-30W. Ordered from Summit racing for cheaper than wallyworld and got an additional 10% off plus free shipping. The 87 Toyota pick-up truck gets straight 40W and just turned 322K miles.
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Old February 05, 2019, 17:16   #5
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I have found that putting new synthetic oil in an older vehicle that has using regular oil will show you if you have any questionable gaskets or small insignificant leaks, they will become big leaks.
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Old February 05, 2019, 17:30   #6
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You're already using syn to an extent. I'd go for it and change the interval to 7500+.

My 2010 Infiniti has never put down a drop of oil 225k with Mobil 1 every 10K miles. Wish I could say that for my wife's 2006 Lexus. It puts a drop on the carport a day
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Old February 05, 2019, 17:32   #7
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I use whatever is on sale at Walmart and it has never made any difference.
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Old February 05, 2019, 19:42   #8
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thank you for the response. I need more feedback about if it is ok or not to make the switch from semi-synthetic to full-synthetic same brand and oil-weight with out any issues. thank you meltblown.
thanks, javier.
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Old February 05, 2019, 20:24   #9
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Quote:
Originally Posted by Mebsuta View Post
I use whatever is on sale at Walmart and it has never made any difference.
I troll for chiXX in WM. I don't buy anything but beer and pizza and a cake. Now I go to Dollar General and get beer, chocolate, and a moon pie
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Old February 06, 2019, 03:06   #10
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Shouldn't be a problem. Been running full synthetic since 50k miles in my 06 Colorado. Before that was semi. Truck has 332k on it now.
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Old February 07, 2019, 00:39   #11
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Quote:
Originally Posted by JAVIER View Post
thank you for the response. I need more feedback about if it is ok or not to make the switch from semi-synthetic to full-synthetic same brand and oil-weight with out any issues. thank you meltblown.
thanks, javier.
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
Since you don't put alot of miles on it, use the stuff! YES you can change to what went into the wifes care...hell yes !
It would take a ton of miles to start showing any symptom of anything, and then you'd have to take the motor apart to prove it.

IF . . . your really worried about the swap. Drain old & replace Filter, Then there is a product at Auto parts store to perform a FLUSH of the oil system . . .
ask them. . . . . Then swap to the other oil.

Did you change to part Syn when you bought it ?
Did the prior owner say he used that?
Did you see service records indicating that ?

Zero worries !

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Old February 07, 2019, 12:44   #12
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I would use the synthetic. On a few engines when switching from regular to synthetic oil smoother running was noticeable on first start up.
We use $1000 per gallon synthetic oil in pumps at the job. The shit will never break down. When it gets dirty we send it off to be cleaned and use it again, over and over.
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