Fraser Is. - Oil wash

Sand will stick to the oil! But theres oil between the sand and car, so shouldnt be any problem.

YMMV

gday chris.
we usually do ours before heading to rainibow beach and then after.
not sure about the ones on fraser island but the ones we use the amount of oil in the wash wouldnt be enough for anything to stick tojamieson wild cat

Is your car properly rust proofed??

If so, skip the oil wash, do the island a favour, and give it a thorough clean (not just the drive over wash) when you get home.

If you don't have a thorough rust proof, then what do you plan to do about the salt spray that gets into EVERYTHING, not just the undercarriage.

Sand isn't your enemy, it's the salt.

Enjoy the island

Chris,
For an environmentally friendly pre-trip preparation - get some Lanotec from Mitre 10 - costs about $23 per litre & 2 litres will more than cover the bottom of any 4WD. Cheap as chips! This is a locally made (right here in Brisbane) Wool oil (lanolin) extract which can be applied with an ordinary garden spray unit - and which will protect the underside of your 4WD from rust.
In addition - I have spray on rust proofing and Electonic Rust Protection System (ERPS - from ARB) for my Prado. It has seen a fair bit of beach work but has ZERO rust on it. I also wash it both prior to and after any trip up the beach - for two reasons. 1. So I don't contaminate the National Parks with foreign matter from other areas of our wide brown land and 2. To remove any salt water that may have somehow made its way into the vehicle crevices. Do all this and you won't have any problems.
I would suggest not using the oil applications on the island (or on the mainland). Not real good for your 4WD or the environment.
Enjoy Fraser - one of our many truly magic places! Cheers,
Prado Boy.

Was there in July and was having a mild panic as I couldn't find any where to get Landcruiser sprayed underneath so had to go without ... after 250k's on the beach (not in the surf) washed down at Kingfisher Resort prior to getting on barge $ 5.50 for a 10 minute power blast ... reckon that was heaps and have seen nothing bad underneath.. except all those little stones that get stuck in the chassis rails from travelling through the Stoney Desert ...don't put bleep oil underneath your unit whatever !!! A lot of the water/ all the ones I checked ... flowing over the beaches at Fraser are freshwater streams flowing out of the lakes !! just stop every now and then and taste the water !!! So its not as bad as it seems !!

Chris,

Regardless of whether you use oil or not, don't rely on the underbody wash to thoroughly clean the car. We were on Fraser last month, came off and used the underbody cleaner in Rainbow Beach, followed by the high pressure wash at Gympie, and when I got home gave it another good wash including getting the garden hose into the chassis rails as much as possible.

I bought a Massojet cleaner the other week and gave it a try in the chassis rails, and it seemed like half of Fraser Island came out!

Moral of the story - there's never too much cleaning after driving on the beach.

Steve

Yeah give it a wash but when you get back , stick the good old sprinkler under it. STill more sand will come out & then after that give it another wash.

Cheers

Jackablue