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SUVs Honda CR-V Honda CR-V Maintenance and Repair
6449 messages, Last post on Dec 01, 2009 at 10:04 AM
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Replying to: trcm (May 06, 2009 2:20 pm) |
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Replying to: blueiedgod (May 06, 2009 9:03 am) And on the viscosity. I switched to 5w-30 early on but switched right back after mentioning it to a top-notch professional mechanic who has the same model CR-V. He says the engine's self-adjusting valves need the 5w-20.
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Replying to: terryp1 (May 09, 2009 12:37 pm)
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Replying to: Mr_Shiftright (May 09, 2009 1:00 pm) Maybe that's what he meant by "self-adjusting".. 
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http://www.carspace.com/bigdadi118/Albums/bigdadi118%27s%20Album/Honda_Oil_Chart- .jpg/page/photo.html#pic 
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Hi- I just bought a new CR-V EX-L Friday night and overall really like the vehicle. I test drove the vehicle before buying and everything checked out. However, the next day, a rattling noise emerged from the sunroof area, and it doesn't matter whether the sunroof is closed, open, or cracked to "vent". I've pushed on the sunroof slightly and it seems to be very sturdy, so I don't know where the rattling is coming from. Has anyone had similar experiences? I am concerned because the sound is really distracting and not something I could deal with long-term on the car. I hope the dealer can fix it right the first time. Would love to know how it was fixed and if the problem came back. Thanks- Don
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Replying to: terryp1 (May 09, 2009 12:37 pm) Yet today's modern oils are vastly improved over those of 20 years ago. For oils that meet the current "SJ" service designation, viscosity breakdown is no longer a significant problem, thanks to modern formulation technologies and viscosity enhancers. Auto manufacturers have also redesigned their engines for tighter clearances and instituted precision machining techniques that take advantage of thinner oil to deliver improved fuel economy through reduced friction. Like the OEMs, racers have discovered that friction reductions plus precision tight clearances yield greater efficiency and more power. Racers also know that most engine wear occurs at start-up, so it's critical that engine parts receive proper lubrication as soon as possible--hence the need for an initially thinner, so-called "winter" viscosity. Today, few racers run a single-viscosity motor oil except nitro-burners. According to 76 Lubricants, most NASCAR teams use the really thin stuff during qualifying, moving up to 20W-50 during the long race (although it's rumored some teams may use the extreme cold-weather thin oils all the time, but don't want to admit to their latest performance "trick"). Synthetic oils, pioneered in the '70s by Mobil and now available from most major oil companies, take the all-season, multiviscosity approach to the outer limits. Unlike traditional mineral oils that are produced by distillation and further refining of existing crude oil stock, synthetic lubricants are made through chemical reactions. These new oils aren't synthetic or artificial in the sense that they're manufactured out of whole cloth--they still have the same natural ingredients found in "real" oil. But in a synthetic lubricant, these ingredients are recombined like a Lego set to yield synthesized-hydrocarbon molecular chains with desirable characteristics and uniformity not found in even the highest-quality traditional motor oils. Typically, the best synthetic oils use a combination of up to three different synthetic base fluids--polyalphaolefin (PAO), synthetic esters, and alkylated aromatics. Because a synthetic oil's molecules are much more consistent in size and shape, they are better able to withstand extreme engine temperatures. By contrast, the unstable molecules in conventional oil can easily vaporize or oxidize in extreme heat. Mobil 1 synthetic is said to be capable of protecting engines "at well over 400 degrees F"; in the real world, most racers have no problem running synthetics up to 290 degrees F under prolonged use, but they get really jumpy when a conventional exceeds 270 degrees F. Because a synthetic oil is chemically produced, there are no contaminants in the oil. By contrast, conventional oils contain small amounts of sulfur, wax, and asphaltic material that can promote detonation as well as varnish and sludge buildup. With no wax, synthetics will flow at much lower temperatures than conventional oils. In fact, synthetic oils are now available with viscosity ratings as low as 0W-30, as in Mobil 1's new Tri-Synthetic blend or Castrol Formula SLX. These oils flow more than seven times faster than a conventional 5W-30 motor oil during initial start-up, yet at normal operating temperatures act like a regular Grade 30 oil. An 0W-30 synthetic oil is capable of pumping easily at -62 degrees F and flowing at even lower temperatures. Conventional oils are essentially frozen solid at that temperature, so there's simply no conventional equivalent to this new grade. There are 5W-30 conventional and synthetic oils, but even here, the synthetic has a real-world advantage: Mobil 1's 5W-30 will pump at -58-degrees F, compared to about -35-degrees F for a conventional oil. Regards, OW
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i just found the new CR-V service manual and share it for people who search for it its Honda CRV service manual 2007 2008 2009 link part1 link part2 link part3 |
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Replying to: circlew (May 10, 2009 10:19 am) Au Contraire. Synthetics do break down. But, because the molecule size distribution is more uniform (think of the bell shape distribution and 99% of the molecule sizes are within 0.5% either side of the median. They all break down at the same rate to the same size. There are no shorter chains that break down faster and longer chains that breakdown to individual molecules longer. shorter chains, once broken down are useless, and become junk inhibiting the still functioning longer chains from performing. Also, not all synthetics are truly synthetic oils with narrow molecule size distribution. Most of the so called synthetics are nothing more than highly purified conventional oils. They are processed through what is called "hydrockracking" or basically steaming. Mobil1(except for Extended Performance), Quaker state, Pennzoil, Castrol Syntec (except for 0W-40 or whichever is made in Germany), Valvoline Synthetic... are all FAUX synthetics. Mobil1 EP, Castrol Syntec (has to say: "Made in Germany"), Royal Purple, Amsoil (don't like their sales tactics) and a few others are still true synthetics. Since there is no price break when buying FAUX synthetics, make sure you buy true synthetic oils. Otherwise you are wasting your money.
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Replying to: blueiedgod (May 13, 2009 8:55 am) I almost got some synthetic the other day though. NAPA was out of 5w30 and the synthetic was on sale for almost as cheap as my usual flavor. But I went to WallyWorld and got a 5 quart jug of SuperTech for under $10.
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